Question OCCT shows a lot of error

how old is the PSU?
which power connectors do you use for the GPU? are you using an adapter or one cable from PSU with two plugs or two cables from PSU with two plugs?

do you have other problems e.g. while gaming?

Did you overclock the GPU?

Was the test using the same parameters and did the GPU have the same frequencies and temperature?
 
So, OCCT shows a lot of error when I first did a power test. After 30 min I tried it again and there was no error. How is it possible or what problem is that?Picture of the problem.
Oh dear. This might be its last day. I have seen it, many times! Many many times, and the repairman the first time I saw it told me it's over, but it's not over! The GPU is PERFECT. You might have to "UNDERCLOCK", the GPU. You might try it now. You should Look it up. You do not have too much time, but enough! And you need to do it fast. It might be very bad. It will be okay, and it speeds up the game.
1. DOWNLOAD, msi afTerburner.
2. LOWER CLOCK SPEED BY 20 MHZ.
3. Lower GPU MEMORY CLOCK BY AROUND THAT MUCH. Do not go too little, it might be very bad.
4. RETURN TO ME WITH RESULTS. I will help, and I can help a lot, the GPU might be very good! It will live very long, this one GPU i had this issue with has been alive for 6+ years since!