Connectivity Problems

Hi All,
Recently, I hauled my behemoth ASR Emitter Exclusive amp to the technician to have four WBT Nextgen speaker binding posts installed in the right channel. The reason; I’d been experiencing connectivity issues where the signal would cut off and on, or all together off, or I’d get crackling and a pop here and there in my right Quad. Of course, before I bought a set of binding posts and loaded the amp in the SUV, I switched between speakers and every cable combination. I had also been in correspondence with Herr Schaefer of ASR and was following his suggestion to replace the right channel binding posts.
So recently I got my amp back home and I am experiencing the same issue. The current speaker cables I’m using are older Hi Diamond, eight gauge cables with banana plugs. These cables underwent repair about seven months ago as I thought they may have been the reason for my problems. I wanted to try connecting them via bare wire but the large cable size is making that impossible. Anyway, I’m concentrating on the cable connection because Herr Schaefer suggested that I use forks instead of plugs. My local audio store has agreed to loan me another pair of cables with spades to see if it makes a difference.
I need to add that my tech did not test the amp because I decided not to bring him my power supply and battery. I wimped out given that the battery and power supplies are as heavy as the amplifier. Once the COVID vaccine is available and my tech has gotten his shot, I’ll be able to get him to make a house call.
Has anyone had this type of occurrence and are their any insights into what might fix them?

Happy Holidays!