Very unstable connection

I bought this router 2 months ago. It worked ok for a month and then I started to lose connection, sometimes reconnecting pretty soon, sometimes not wanting to reconnect, sometimes I couldn't even see my network. Normally it comes back by itself after a while or after a reset or whatever but no guarantee for how long my connection will stay up. Sometimes it's ok for a couple of days, sometimes it's cutting me off a few times in one night.

I tried Linksys tech support on the phone and after waiting forever and finally getting through, the call got dropped. After that I've used Linksys online chat which is decent except it always disconnects when you change the router settings and when you go back you get a different person who tells you something else. So far, they told me to unplug my cordless phone which didn't help, change various settings and the next techie tells me to change them back again, upgrade firmware etc. Nothing works. I am about ready to throw it in the garbage but I paid a bit much for that. The store where I bought it says it's not their problem anymore so probably I will have to mail it to Linksys and hope it comes back better.