Uh-oh, not good. I've seen that vertical banding on nearly every FF/SD ever made sooner or later, especially external models. It might have gotten damaged somehow? Overheat maybe? Some things to try:
1) update to the latest firmware and follow the instructions to the 'T' when doing so.
2) examine all the pins of Lisa's socket for potential debris and bent pins. Also examine Lisa to see that no metal shards are shorting anything out.
3) ensure the Indivision is properly and securely seated and if need be, put something small and rubber (like those little sticky feet for components/computers) a top of the Indivision so that it just hits the RF shield, forcing the Indivision down to Lisa.
...in no particular order. Try the easy stuff first and go from there.
BTW: does the video output without the FF/SD give you the same banding? Probably not, but thought I'd ask.