@Bireshwar Thank you for this, which firmware version do you recommend?

@Log same here still rebooting several times a day. could not install older firmware.

Same problem for last 1 week. No solution.

@dmk I've binned mine now. Got sick of it. Got no sense from the tech help desk either. Change the power adapter they said...wtf? Change from the one you sold me in the box?? Anyway, I've bought a Google nest. Wish I'd got one much sooner. I'm getting increased coverage, increased speed and best of all, 100% connectivity. 

@Leesy 

Joining the club on this one. Random reboots, 3 or 4 times per day. Logs the same as what is being shared on here. Waiting for the 'senior engineer' to get in touch. I suspect I know how that will turn out.

I have been contacted by an engineer who has provided a Beta firmware which is newer than the current release. I've installed it and been asked to wait a few days to see what happens. If it solves it, then I guess they acknowledge there is an issue.

For anyone following this thread about rebooting, you may wish to review latest comments on this link where there are similar issues that would seem to have been isolated to iOS 14 devices causing the reboots, and it seems that updating to iOS 14.1 (or disconnecting iOS 14 devices) MAY have resolved it.

Following this thread as I just started having this same issue.

@Mr.p Okay. I've seen someone say it's an IOS 14 problem. And it sounds about right except for one thing. I had one IOS device connected to c9 but it was running IOS 14.1 not 14. I disconnected it last week. No issues since that. So If you have any IOS devices I would just disconnect them from the wifi no matter what versions of IOS they have.