1. The phone is an Huawei Ascend P6-U06, in the back of the phone the letters are in Chinese (i don't knows if that matters actually)
2. The phone works with a 3G SIM (Digitel Venezuela), this carrier also provides 4G-LTE network.
3. The phone is unlocked and actually gets H+ data connection.
4. The problems came when from time to time (1min ~ 30s) the signal is completely lost, voice & data, and it came back after ~15s or so. Is like i set it on and off Airplane mode. This is a non-stop loop that drains the battery.
A. If device is plug to any power source, the connection is stable.
B. If exist an active connection (like an Play App Download), the device won't lost the signal until the download ends, independently if the downloads is 30 mins or more .
C. I have tried with other ROMs, officials : B108-B113, B512, B513, B634, B635 y B708, also with non-officials ROMS like: CM10, CM11, MIUI6.
Workarounds tried (fails):
i. Set "WCDMA Only" using service menu *#*#4636#*#*, i read it on a Nexus forum that it presents the same failure on ROMs based on 4.3 & 4.4, It says it was a framework/hardware issue. But in my case, the phone reset itself to "WCDMA Preferred". (While is it WCDA Only connection is stable), also tried directly set it to SQLite DB, but doesn't worked.
ii. Also tried with the project menu *#*#2846579#*#* doing the 3-steps method mentioned on a website (i can't share links yet), in the final step says "Network mode set Failed".
iii. Doing a Ping every second to Google through a virtual console keep the connection up and make it more stable (like 80% of the time is up), but the battery get drain fast (without mention data consumption).
Any other details that i should provide, please guide me and i will send it over to you,
Thanks in advance,