Signal issue on Atari 2600

[Dreammary]

So I’ll be playing a game on my Atari 2600 4 switch woody and suddenly the clear image goes all wavy. The image and sound are nice and stable then just randomly this happens until I turn off the console and turn it back on, then it’s fine again for awhile. 
 

Does anyone know what might be causing this to occur?

Edited December 18, 2020 by Dreammary

[Voxel]

If the PSU is an old one, it may be on the way out.