Pioneer DDJ-1000 Flashing Cue Buttons

Hi, I have an issue with my DDJ 1000 controller

When I turn on the controller, everything works fine, but cue buttons are flashing everytime. Doesnt matter if pc is connected or not, i just turn on the mix on the controller and its flashing all the time. Pressing buttons doesnt help, pressing them with shift button doesnt help, still flashing. I tried to find out solution, but it seems that nobody had that problem before, so im afraid it is a hardware problem, because i tried to update firmware and software, but didnt help

I uploaded video on youtube, so i give you a link here and you can see what its actually doing.

Cue buttons work, i mean if i put headphones in and press the cue button, the music plays in my headphones, but its still flashing so i cant recognize if its pressed or not (hope you understand me). Anyway the controller works great, other buttons work as they should (you can see on the video, where im pressing other buttons).

I had my controller on cleaning service last month and its happening since that (it worked good before the cleaning service). I hope its only small issue and easy to fix, or ill have to send it again for repair.

Here is the link of my video, where you can see that problem:

https://www.youtube.com/watch?v=tJhIlbGsfqQ

Thank you very much for help and have a nice day. :)