Chess.com site is not stable.

This site will let you get in the middle of a game, then freeze you up, and bring you back when your time has run out.  This is done as it is showing you your opponents time is runnign down to zero.  When it gets you locked into a game, at times it will not let you resign, but freeze you in, and you have to shut down the site to get out.  It has happend to me several times, and I have reported it with no response in something being wrong.