I bought an 42" aluminum cellular Apple Watch yesterday. I paired my watch and phone, set up AT&T cellular. I went outside and tested it immediately. Great signal. I used it last night and this morning. Worked great. Today I updated to 4.0.1, now I can't get a cell signal at all. On the Explorer face, you can see that it's looking for a signal, but never gets one. I rebooted both the watch and the phone, unpaired and paired them back. I've been trying for the past 4 hours, but no signal. I might have to call AT&T to see what's wrong after a software update. Anyone else have this issue?