Occassional random loopiness occurring every few hours, as if the player has received a button code. Possible incarnations include (in order of observed frequency);

Rapid switching between Player and Aux as if someone is stabbing the 'Source' button every 2 seconds.
Continuous Fast Forwarding through tracks as if the right button is being held down.
Player shutting itself down as though the top button were held down.

In all cases, a valid button press, knob twiddle or IR code breaks the cycle and restores proper behaviour. There may be other similar symptoms that I didn't see.

If this problem is suspected then the test is to check /proc/empeg_ir, both immediately after boot and then after the player has run for a couple of hours.This can be done;

from a shell prompt by typing "cat /proc/empeg_ir". or
through hijack's web interface by visiting "http://empegs_ip_address/proc/empeg_ir".

Within that output we are interested in the "Missed Interrupts" figure. It should be considered normal if a few (<20) are seen at bootup. After a couple of hours, numbers in the thousands are cause for concern. A player reporting ~9000 is known to suffer from the loopiness. A player reporting ~3000 has not been witnessed suffering, although it's possible that it does, only less frequently. A good player has a negligible or zero increase from the value reported after boot.