Flashing pink is probably a poor statement by me, what I mean is, as the camera angles changed occassionally when it went to a full-shot of the court you could see the playing field colour shift from green to a shade of pink, then back to green. The players and everything looked fine, just the playing ground would briefly and randomly have that strange effect.I watched a lot of the 4K Wimbledon and was very impressed with it. Didn't see any of the pink flashing issues you mentioned. F1 is pretty good although I only watch on Ch4. Only problems I've had with the FZ has been Sky based. Flashing issues on Das Boot 4K and a few on City on a Hill 4K. I've put all these down to either broadcast or download issues even though my speed is 40kbps plus.
I've not seen it since, but then again I don't watch much live TV. I only really watched the Rugby as I hit over 1300hrs used at the time, and figured it'd be a good test to check on vertical banding and motion again. I literally recorded it on a Youview box in a different room and then hooked that up to my aerial-less OLED afterwards just to watch it off the HDD Library. A bit of a pain, but worth it for a one off.
I see some people rate if you don't see any bands on football and the like then you're probably OK in that regard.