Problem solved.
Hi Shubell, you were right. It was a frequencies annoyance. After installing Thumb, system was booting trying to overclock at 850, as it couldn't phone was rebooted and loaded default frequencies limits 125 600. As 125 was avoided there was no way being stable.

As I prefer using undervolting for battery saving I use this settings:
and works OK:

sudo gainroot
kernel-config show
kernel-config load xlv
kernel-config limits 250 805
kernel-config save myprofile1
kernel-config default myprofile1

Thanks Shubell