Weird Popping issue

Hey all,

I have a primaluna stereo amp and have been having some issues with it lately and was hoping to get some advice on what action to take next to try and resolve the issue. 

Each time I turn on the amp, the amp warms up, the audio signal comes through, and then maybe a minute after it has warmed up and started the audio, i hear a couple loud popping sounds from the right channel and then i lose all sound from that speaker. The audio keeps coming through the left and the sub however. The only way to remedy the situation is if you turn off the amp again, wait a little, power the amp back on and then i don't have any issues with either channel. 

pretty new to tube amps but haven't had any problems with my gear before this.

any help that you could provide would be more than appreciated. 

let me know if there is more info i can provide to help you understand my situation. 

Thanks a lot.