Very occasionally, when it is cold out, within a minute of starting my MINI, I hear a high pitched tone through all my speakers. Then seemingly randomly, music will be garbled and staticy through the rear speakers. The static may occur for a few seconds or minutes, go away, come back at random. The high pitch sound is always there.
This won't stop unless I fully turn the ignition off and back on. Turning the stereo off and on has no effect. It will do the same at low and high volumes. It will continue no matter what input is selected. I've experienced this about 10 times and again today was the last straw. It is obviously very annoying while driving.
It has been unseasonably warm, in the 30s and 40s, then today it finally dropped, my OBC read 25. Every other time this has occurred has been when it was cold out, usually a cold morning but in this case was the evening.
Here is my post when I first experienced this...warmer but also a relatively and suddenly cold morning.
I strongly suspect my HK amp as it adds complexity and it also treats the sound to the front and back differently, but it it could be the boost head unit I suppose.
6-month-old 2004 MCS with HK plus AUX input and Sirius satellite (again it occurs on any and all inputs).
Has anyone else experienced this?