FreeDVB

MSNBC often goes into scramble. Mostly all I have to do is change channel and then go back and it fixes the problem for a little while. Other times I have to turn the unit off and reboot to fix the problem. I have tried deleting that TP and then rescanning without success. Tonight the box is locking up on this channel and I have to remove the power and then reconnect to fix the problem.
Is there a fix for this problem?