And we had to work it by changing what upconverts the content (content is in this case VHS).
If you can connect with a Composite connection the issue vanished for us.
Upconverted HDMI signal drops for VCR every couple minutes then comes back after a second. Using a Denon AVR-1910 receiver, an old Samsung VCR and a 51" Samsung Plasma TV. Using composite/RCA cables from VCR to Receiver then HDMI monitor cable goes to TV. Any help?