3G after auto switched off Do not Disturb

I meet the following problem:

I set my D'N'D to auto between 22:00 - 6:58. It's work correctly: switched on at 22:00 and switch off at 6:58. After the D'ND switched off, around 9:00, I switch on my mobil net(3G), but it's not connect to the carrier. I check my settings, and mobilnet83G too) is switched on.

I switched off my mobilnet, and put the phone in to airplane mode. Then switch off the airplane mode, and turn on the mobilnet. After this process, it's immediately connect to the mobilnet, and I can use my 3G.

Am I do this whole process in every morning to use the 3G?!!? 😠