Hello there Heltec community 
I want to share my experience with the AB02 CubeCell devices for trying to solve my problem and help other people with a similar issues.
Long story short: with the “pingpong.ino” factory code and any other which integrates LoRa P2P communication I have realized the devices always stops to working in a concrete minute after send/receive bad data, independently of the working time (I have attached one picture to show it because I’m a new user in the forum).
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After trying some methods like buffer cleaning and software reset, I don’t think is a problem based on coverage, packet loss and working time so I’m very lost because this cursed hour sounds to me like something deeper related with the manufacturer libraries or factory bootloader… Also I have detected this problem appears on scripts which are alternating TX and RX status on the devices.
Thanks to all and please feel free to ask me for details, any kind of help will be highly appreciated!