[mythtv-users] Playback speeds/slows after a few minutes

[Beck]

Hi, all.  I'm really enjoying MythTV but am having one strange problem:

When I am watching Live TV or a Recorded Program after a few minutes all of 
the sudden the playback will change rate.  Sometimes the playback is faster 
than regular speed and sometimes it's slower.  Once it happens the only way 
to solve it is to jump back to the menu and then back into the 
program.  Anyone have any ideas?  I can't seem to find anyone else with 
this problem.

Here's a less critical question:  I have both cable and a satellite box 
hooked into my MythTV.  When I'm watching Live TV cable, I can change 
channels with the up and down or by typing the number, but the Satellite 
channels are unavailable.  I can't seem to "switch over" to satellite 
stations.  If I tell Myth to record a satellite station then afterwards I 
can browse those stations on Live TV but can't select any regular cable 
stations.  Is there a key I need to press to toggle between the two sources?

Thanks in advance!!
D