I have a problem with ICS and it's mail app running extremely slow and causing the phone to heat up so hot you can't hold it. Here is what I have experienced.
I did a factory reset yesterday then shortly after updated my Razr Maxx to ICS (I know I didn't have to do the FR, but I wanted to start from scratch). I setup my Gmail, corporate mail, Facebook and Twitter. Those were the only apps I had syncing. I noticed the phone seemed to be running extremely hot, but chalked it up to having the screen on for an extended period of time while playing with ICS (although I've streamed Netflix for hours under Gingerbread and never had the phone get this hot).
Anyway, today I was checking my corporate mail and was receiving new messages (again the phone was really hot and I was hardly using it). Then suddenly the mail app froze and all the messages disappeared. I hit the sync button in the mail app and the messages started to crawl in, extremely slow. 45mins went by and I still didn't have my current messages (I only sync two weeks worth). And again the phone was extremely hot.
I did another factory reset on my phone and left it sitting (plugged into the wall outlet to charge) for an hour. It cooled down and remained cool. Then I setup ONLY my corporate email (no Gmail, no Facebook, no Twitter) I did not download a single additional app or even install any updates (which it wouldn't do anyway because I haven't logged in with my Gmail account yet)
I set my corporate email to sync 2 weeks of mail, calendar and contacts. Once again my Razr Maxx is EXTREMELY hot and the two weeks of messages have been syncing for over an hour and have only reached one week's worth. I have a 4G connection full bars (same as I had under Gingerbread).
It seems to me there is some issue with the ICS mail app on the Razr Max. Is anyone else experiencing this issue?