I've been using a WA850re extender for a couple of years now. Suddenly 2 or 3 months ago I started noticing the signal going off for a minute or so, enough to disconnect me from calls or online games I was playing. When this happens the only light that remains on is the power one. After some troubleshooting I thought the extender was failing so I got a an RE200. For the first few weeks the cuts were gone, but suddenly they started to happen again, and even more frequently. 

As far as I know nothing has changed regarding my isp. We changed the router last year, but it had been working fine for several months untill the cuts started. I've also tried using different power sockets but it made no difference.

I'm wondering now if it is a software issue but I've realy got no idea.