Well, good news, more good news, and some bad news.
Good news #1 - Conundrum makes weight, with a cover, and everything in full working order.
Good news #2 - I got it to run reliably, spin up the drum every time, and drive around with the drum spinning for three minutes several times in a row.
Bad news - somehow, inexplicably, the same problem I was having over the summer reappeared.
I don't know what happened. I didn't change anything! The radio cuts out worse than ever before! I don't even have to spin the drum, just driving around does it. I don't get it. I just don't fluffing get it.