Default [Q] maximus hd 10.0.01 signal drop issue

Is anyone has the same problem? I ve flashed the Rom several times and I have that problem.when I lock the phone
for a while the signal drops.is there an option no to do that or it is bug? Sorry for bad englishEnglish..thanks in advance
Edit:I flashed new radio 1.20 and problem solved.the last radio was 1.11