i have noticed many bugs in the radio system, it likes to get stuck, plus its kinda slow anyway, if you gave it enough time itd come back into service but i doubt you wanna wait that long lol. you could try refreshing everything, might be the copy of the rom youre using, might help if you do a wipe, who knows, but i have noticed that its radio is kinda weak and sub par myself so it may just be that its a cheap phone