GM29 Sony-Ericsson modem problem

Started by GM June 19, 2009
I have a GM29 Sony-Ericsson modem for a fleet tracking system. I was 
doing firmware tests for the 8051-based system that controls it. The 
modem did work well previously, but from yesterday when it comes to the 
stage to set the APN (with AT+CGDCONT) the serial coms come to a halt 
(from the modems point of view). I did connect from my PC to the modem 
directly and repeated the sequence and again the modem stops responding 
after trying to set the APN. I guess this is some kind of malfunction. 
Note that during a test, the modem did remain connected for more than 2 
days, but I believe this shouldn't cause a problem. After all the 
operating temperatures for this modem are from -25� C to +55� C, so I 
guess it shouldn't have a problem. Has anyone experienced something 
similar with this modem? Could it be something else? Thanks

Best Regards

PS: Sorry for my english