It's usually said to be a problem with the batteries of the remote - change them for new and it should not happen again. There is also a suggestion that the D400-D440 upgrade also includes some work on the remote to prevent this occurring.
I see you have WB Vectors - which have a SAM profile - did you have SAM active? If so, then there should have been some protection for your speakers. I hope so.
I see you have WB Vectors - which have a SAM profile - did you have SAM active? If so, then there should have been some protection for your speakers. I hope so.
