I have the the 2750mah extended battery and cover through Verizon. I know my cover seems to creek and I seem to be having a few signal drops now. Seems to be getting worse. Could the cover be the issue? I know there are different covers. Are certain ones better than the others? I put my regular battery and back on today and it seems to be a little more stable. Also with the ext. I was getting a temporary ...no sim card notification...when I would reboot . It would go away Ayer 10 seconds or so. It hasn't done it on reboots since I went back to the regular battery and cover. I am running the last leak. Any ideas???