Possible, I found something:
I also had a lot of RIL (signal lose) problem with CM10 and CM10.1 ROM (and also others, with base on this two roms).
(I hadn't any reboot, but I don't use 3G)
My baseband is 2030 what comes from Vodafone 4.0.3 - 934 (official Hungarian) . After that I used many custom roms. Inculded CM10.1 R4 (with other roms wasn't signal problem, but I had speed and battery problems).
Yesterday I did this steps:
I formated my SD card and I installed the official Huawei 4.0.3 - 952 (Global) from SD card.
After that I rooted my phone and unlocked my bootloader.
Installed CWM 188.8.131.52, last I installed the CyanogenMod 10.1 R4.
Now my phone runs with it longer than 24 ours, and I hadn't any signal problem.
My phone now is faster then anytime before. Battery performance also excelent. No any problem!!
I continoue the test, but I hope, will not be more signal problem.