Customer Uses WAF but keep losing the session while downloading something with -curl from servers behind Sophos.

2022:02:02-16:32:33 cloudoffix httpd[19305]: [proxy_http:error] [pid 19305:tid 3783355248] (70008)Partial results are valid but processing is incomplete: [client yy.yy.yy.yy:49995] AH01110: error reading response
2022:02:02-16:32:33 cloudoffix httpd: id="0299" srcip="yy.yy.yy.yy" localip="xx.xx.xx.xx" size="1177224" user="-" host="yy.yy.yy.yy" method="GET" statuscode="200" reason="-" extra="-" exceptions="-" time="8316961" url="/web/content/15779" server="demotr.cloudoffix.com" port="80" query="?download=true" referer="-" cookie="-" set-cookie="session_id=6a7b0f31c09fe2fe278ea0be4f05426ba3b70692; Expires=Tue, 03-May-2022 13:32:25 GMT; Max-Age=7776000; HttpOnly; Path=/" websocket_scheme="-" websocket_protocol="-" websocket_key="-" websocket_version="-" uid="YfqH6BPiATQveMEP9RRTAwAAACk"
2022:02:02-16:33:00 cloudoffix httpd[19305]: [proxy_http:error] [pid 19305:tid 4060314480] (70008)Partial results are valid but processing is incomplete: [client yy.yy.yy.yy:50105] AH01110: error reading response
2022:02:02-16:33:01 cloudoffix httpd: id="0299" srcip="yy.yy.yy.yy" localip="xx.xx.xx.xx" size="1269896" user="-" host="yy.yy.yy.yy" method="GET" statuscode="200" reason="-" extra="-" exceptions="-" time="9351402" url="/web/content/15779" server="demotr.cloudoffix.com" port="80" query="?download=true" referer="-" cookie="-" set-cookie="session_id=c66cb98f80d6fad2d836bacd6082f555d8b2eeae; Expires=Tue, 03-May-2022 13:32:51 GMT; Max-Age=7776000; HttpOnly; Path=/" websocket_scheme="-" websocket_protocol="-" websocket_key="-" websocket_version="-" uid="YfqIAxPiATQveMEP9RRTlwAAAAg"