what would cause volume to sudden ramp up to full?

This has happened to me when changing tracks on my Cairn CDP via the remote. The infrared code for track advance is the same code used for volume up on my Heed integrated. I've been told that quite a few high end manufacturers use similar sets of Phillips I/R codes which may be responsible for this type of havoc. I've eliminated the problem by using an RF capable remote and receiver. Try picking up an MX series URC brand remote and MRF base station... should do the trick.

A couple of times during thunderstorms while listening to a Forte F44 remote controlled preamp I was in the room while the volume ramped up all the way by itself. I chalked it up to the lightning. Other times I'd return home and mysteriously find the volume on max. Sometimes the volume motor would lock into advance mode like it had a mind of its own. Unplugging the unit would reset it. To protect the system when not in use I learned to engage the mute relay. Convenience has its consequences.

A perhaps related note: I cannot use my preamp remote (Kavent S-33) when operating my little remote indoor helicoptor...I've had the helicoptor hovering in its gyro mode while attempting to adjust the Kavent and the volume goes insane causing me to make an emergency landing for the heli. Once landed (or crashed as the case may be) it's all good. Also, the heli loses its mind in a certain spot near my gear...it hits the Squeezebox stream or something...this is the kind of thing I deal with...life is not always easy.