I had issues with arc on my lg 65c7 and th onkyo 656. After doing a lot of troubleshooting I got rid of the onkyo and moved my DENON x4300. I sold that Onkyo for a loss. Good riddance.
I remember when Onkyo used to be a solid brand.
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JVC RS400,Optoma 27HDR, Denon X6300H, Klipsch RP-280F x 2, RP-450C, RB-51 II x 2, RS-42 II x 2, RB-41 II x 2, R-150M in 7.1.4, 150" Silver Ticket
LG 77C9, Denon X4300H, Klipsch RF-26 x 2, RC-52 II, Onkyo speakers in 5.1.4 setup
LG 55CX, Klipsch 2.1 Certified THX speakers
Sony 34XBR960 x 3, Apple Studio Monitor 21", Panasonic 50VT25