I have Aqara M3 hub and some devices connected to it, this hub is connected to SmartThings hub through matter. Aqara hub got offline couple of times in the smartthings hub while it's online in Aqara app and healthy. Note that I have another matter devices in the router and never have this issue.

I contacted Aqara supfor this issue and after checking the hub log they replied that its router issue.

Anyone got any idea why is that?