I have 100 plus gpx2160 extensions and since the latest update they keep locking up, in that the phone will not receive or make calls and the BLF are in a frozen state as well. I need to reboot the phone to correct it. Even if the phone is not used it happens, when the phone is in this state the 3cx shows it as not provisioned in the phone list. I have been using them on 3cx since V12 up to V15 with templates from grandstream no problem. When I see that 3cx was going to support them I upgraded the firmware on all phones to 188.8.131.52 from the link on 3cx website, at this point all was still ok. When I upgraded the 3cx system to the latest 15.5.8801.3 that’s when I ran into problems. I have reset all phones to factory state, they have firmware 184.108.40.206, and I have used the default 3cx provision template as well. I now keep getting user`s saying their phone is not ringing and they cannot dial out so they need to reboot. This happens about three times a day and I can’t fix it and have no way of going back? Please help me! At least I did not run into the constant ringing problem, that some people had because they did not use the correct firmware. I came across other problems like the default for the PC port is disabled, the allocation of the BLF have moved up starting at No 23- 48. I had to remap all my BLF extensions for all users whick took a bit of time!