Peterjo78, you are the man! I have been struggling with this since I got the 12.2, however here recently it has gotten much worse, almost making the tablet unbearable to use. I reluctantly replaced the ROM with CyanogenMod, thinking it was a problem with the Samsung ROM. The problem immediately got worse (not saying anything was wrong with the CyanogenMod ROM, I love it!). I tried your fix of placing a plastic spacer under the motherboard near the display cable connector and for the first time in months it has worked for a couple days with no flicker! Hoping it holds, but wanted to pass on thanks for the info!