Nolan - KI5IO
Friend of mine in Eastern Oregon Mountains was experiencing what seemed similar. Tried all sorts of normal trouble-shooting steps with no resolution.
He was running WSJTx and monitoring WSPR. When that APP was running the flashing was constant.
He finally did a clean removal of WSJTx and downloaded the current version, did the install ... turned on to where he was again monitoring WSPR and "no flashing".
May be a different type of flashing, but thought I would toss it into the mix of this conversation.
73 - Nolan K.