Vectrex screen issue

[80s_Atari_Guy]

Bought a vectrex a few months ago and now it's starting to play up.

 

When you first turn it on cold, it will work for around 5+ minutes before the screen starts to zoom in and out, before fading out and just the sounds are heard.

If I turn it off and on then it's just the sounds. If I leave it off for a few hours then it works again for 5 minutes before the problem re-appears.

 

Does this sound like a capacitor problem ? Or worse ?

 

Any help, most appreciated.