1) I found that clear data advice on this forum and have been sharing it ever since
2) That is only a temporary fix. I haven't seen the problem since I made 2 other changes: a) gmail app > settings > labels > inbox > sync all AND b) stopped using wifi altogether ever. I have ready many complaints about wifi causing odd problems. Just today I read about it causing problems with the music player! If you use wifi, you may want to reboot when you are done. Rebooting also does wonders for my outgoing call quality. Hopefully 2.1 will fix this.