I keep my H9000R in a “machine room”, which in my case is just a fancy term for a closet with sliding doors. These doors block the sound of the fan, which is why I keep the H9000R in there.
But the closet can tend to be a bit damp, and on one occasion only two of the DSPs were seen by the device. So I looked inside and popped the DSPs out, only to find that the “missing” DSPs had mold growing on the contacts. I cleaned them off with some spray contact cleaner and a rag, and wah-lah…problem solved.
Now I’m careful to not always keeps the closet doors completely closed, thus letting the air circulate, and the problem has not returned.
