Internet Frequently disconnecting in Sophos XG 210 firewall

The internet connection is disconnecting for 10 or 20 seconds. Then he comes back. but the gateway is not down. Chrome or IE does not open the page either. It refreshes after 10 seconds

we are using 2 ISP, using SD-WAN we forced to send traffic via Airtel and TATA, getting same internet disconnect, we raised ticket no of times. still didn't get permanent solutions

Please help me to fix this issue soon.. 

our firewall firmware version SFOS 18.0.4 MR-4 ,

Edited TAGs
[edited by: emmosophos at 7:26 PM (GMT -7) on 8 Apr 2021]
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