I have found several computers where sophos auto update has uninstalled sophos heartbeat. In investgating, I found this in c:\programdata\Sophos\AutoUpdate\SophosUpdate.log:
Before Uninstall:
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain =========================
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain SophosUpdate is starting.
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain AutoUpdate version : 5.5.0.26
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain SophosUpdate version : 5.5.0.141
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain Build : 203431
2017-01-13T00:03:34.246Z [ 4732] INFO WinMain =========================
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Platform ID: WIN_7_X64
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Platform upgraded: 0
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Subscription: WindowsCloudNextGen RECOMMENDED 11
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Subscription: WindowsCloudHitmanProAlert RECOMMENDED 1
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Subscriptions changed: 0
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Features: APPCNTRL AV CORE DLP DVCCNTRL HBT NTP SAV SDU WEBCNTRL
2017-01-13T00:03:34.246Z [ 4732] INFO Environment::Print Features changed: 0
Change that prompts uninstall:
2017-01-13T00:30:03.574Z [ 816] INFO WinMain =========================
2017-01-13T00:30:03.574Z [ 816] INFO WinMain SophosUpdate is starting.
2017-01-13T00:30:03.574Z [ 816] INFO WinMain AutoUpdate version : 5.5.0.26
2017-01-13T00:30:03.574Z [ 816] INFO WinMain SophosUpdate version : 5.5.0.141
2017-01-13T00:30:03.574Z [ 816] INFO WinMain Build : 203431
2017-01-13T00:30:03.574Z [ 816] INFO WinMain =========================
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Platform ID: WIN_7_X64
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Platform upgraded: 0
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Subscription: WindowsCloudNextGen RECOMMENDED 11
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Subscription: WindowsCloudHitmanProAlert RECOMMENDED 1
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Subscriptions changed: 0
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Features: APPCNTRL AV CORE DLP DVCCNTRL SAV SDU WEBCNTRL
2017-01-13T00:30:03.574Z [ 816] INFO Environment::Print Features changed: 1
2017-01-13T00:30:04.339Z [ 816] INFO UpdateLogic::SyncAndInstall::<lambda_67afd400510729eb7249e1b2d6e29fde>::operator() Removing orphan products.
2017-01-13T00:30:04.339Z [ 816] INFO internal::IdentifyComponentsToRemove Orphan product found: 8E360AC3-A63E-48C8-AAC0-B02090ED484C
2017-01-13T00:30:04.339Z [ 816] INFO ProductInstaller::UninstallSetupDlls Beginning uninstallation of products.
2017-01-13T00:30:04.339Z [ 816] INFO ProductInstaller::UninstallSetupDlls Uninstalling component {8E360AC3-A63E-48C8-AAC0-B02090ED484C}.
2017-01-13T00:30:04.339Z [ 816] INFO ProductInstaller::MakeSetupDLLPath Setup DLL path C:\ProgramData\Sophos\AutoUpdate\Cache\decoded\hbt\Setup.dll.
2017-01-13T00:30:04.339Z [ 816] INFO ProductInstaller::UninstallSetupDlls Setup path C:\ProgramData\Sophos\AutoUpdate\Cache\decoded\hbt\Setup.dll.
2017-01-13T00:30:04.339Z [ 816] INFO check_manifest Checking manifest:C:\ProgramData\Sophos\AutoUpdate\Cache\decoded\hbt\manifest.dat
2017-01-13T00:30:04.713Z [ 816] INFO SetupDLLManager::OpenDll Trying to load setup.dll of product 8E360AC3-A63E-48C8-AAC0-B02090ED484C.
2017-01-13T00:30:04.729Z [ 816] INFO SetupDLLManager::OpenDll Setup DLL loaded C:\ProgramData\Sophos\AutoUpdate\Cache\decoded\hbt\Setup.dll.
2017-01-13T00:30:04.729Z [ 816] INFO SetupDLLManager::Uninstall Trying interface IProductRemoval of product 8E360AC3-A63E-48C8-AAC0-B02090ED484C.
2017-01-13T00:30:04.729Z [ 816] INFO SetupDLLManager::Uninstall Successfully established interface IProductRemoval.
2017-01-13T00:30:25.949Z [ 816] INFO SetupDLLManager::Uninstall Reboot state: 0
2017-01-13T00:30:25.949Z [ 816] INFO SetupDLLManager::Uninstall Successfully uninstalled product 8E360AC3-A63E-48C8-AAC0-B02090ED484C.
2017-01-13T00:30:25.949Z [ 816] INFO StatePersister::Save Overwriting state file C:\ProgramData\Sophos\AutoUpdate\data\status\SophosUpdateStatus.xml
2017-01-13T00:30:25.949Z [ 816] INFO SDDSDownloader::SyncInternal Policy features have changed: forcing full decode.
2017-01-13T00:30:25.949Z [ 816] INFO SDDSDownloader::SyncInternal Beginning decode
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/manifest.dat
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/setup.dll
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos Heartbeat.msi
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/BPAIF.dll
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/HbtAdapter.dll
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/HealthApi.dll
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/Heartbeat.exe
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/integrity.dat
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/NOTICE.txt
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/scf.dat
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/sof.dat
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/Config/Heartbeat.xml
2017-01-13T00:30:26.230Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat/Config
2017-01-13T00:30:26.277Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos/Heartbeat
2017-01-13T00:30:26.277Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt/Sophos
2017-01-13T00:30:26.277Z [ 816] INFO SUL-Log [I39856] Purging file C:\ProgramData\Sophos\AutoUpdate\Cache\decoded/hbt
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