JLD 612 Flickering On & Off,works few min then?

[ddwolfnet69]

https://drive.google.com/file/d/19jlm-1 ... sp=sharing
.
Unit had been working correctly? Sometime it will work fine for a a few minute then start clicking and flashing as u can see in the vid from Google drive. The PID had been replace with new one resonantly. This is for a powder coating oven. The Controller is wired to control 2 SSRs. Based on this behavour hoppefull someone could point me in the right direction or what may be the problem or what to check? thanks for anyone's input...