I would try just killing the IM app first. That's what I did, and have not had any problems since. I wasnt getting data drops like everyone else, but I could barely keep a signal in my house. Now I get 2 to 3 bars all the time, and my DL speeds are faster. Changing sims may or may not work. These fixes are all anecdotal and no proof that in the long run they will not fail again. Since the Razr does not have this issue while the Maxx does, the only other thing I can think of is there were errors introduced in some of the coding in the 6.12.181.XT912 update (Maxx) vs the 6.12.181.XT910 (Razr) update. Only have to an error on one line in a critical part of the os to create this mess. And who knows, downloading the update could have created an error in the update depending on how stable the connection was. Whether is was through wifi or 4G. That could explain why some people have the issue, and others do not on the Maxx.