cannot make phone calls unless restarting?

[rozroz]

hi,
first HTC One,
Android 4.4.2
Sense 5.5

i started having this strange bug:
for no apparent reason, suddenly every phone call i try to make ends after 1-2 seconds,
before even reaching the recipient.
only way to resolve it is restarting the phone.
after a while the problem can repeat itself randomly.

anyone else have this? is it solvable?
thanks.

 

[rozroz]

any ideas?

 

[rozroz]

hate to bug you guys,
but does this means-
no one here ever had this problem?
ot no one knows how to solve it?