T-Mobile mda Audio,Signal, problems

I have a T-Mobile mda and every thirty minutes the audio speeds up and it looses signal (goes on searching mode) then sometimes it has 1 bar and i dial and i get prompted for my sim pin, i have have the problem since i got the phone, I have windows mobile 6 touchflo!!!! and to fix the problem i have to power cycle it everyday and im sooooo annoyed with the phone,,.....
I also dont want to go back to windows mobile 5!!!!!!
What do i do???