Question [Q] Telephony stops when tablet UI

I'm using a root Samsung Crater w tablet UI.
However, receiving calls is never able then mobile networks break dn then I've to reboot.
The mobile networks also break after a calling, a reboot is also required.
Thanks for any root measures to this.
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Owns an Crater as the second phone since March 8 2014
The previous & initial one is PrimoU
An Samsung lover & Android player 51191908@tower.of.saviors