Run my deck again on Saturday.
I have used this same card many times on 24/48 with zero issues. The two previous times I used it, it was set at 24/96 and gave me "Time Write Out" error.
This time it was set at 24/96 with the same unapproved SanDisk Ultra card.
Three mins in, it gave the Time Write Out error message twice.
I powered my deck down, restarted it, and dialed it down to 24/48, and it worked flawlessly for the rest of the night.
So, I feel like it's a little victory for me, because I now know the problem my deck is having. No more (knock on wood) wondering if the deck is going to stop a recording. Which was really my biggest concern.
It sucks that I can not use my deck to it's full potential, and I'll deal with that on it's own; but at least I'm fairly confident that I can run it at 24/48 (or lower) with this card and have a trouble free recording.
I did get a PNY card with a higher speed rating (another trouble-shooting theory I have) which I'll get around to trying soon.