Handshake issue between Elite Kuro and Marantz

[VeryNew]

I've been having HDMI handshake issues for the past two or so months now.

Everytime i switch to different input on my Marantz sr5011 reciever it'll take at least 5-10 minutes before my Elite Kuro Pro 101FD stablish a proper handshake. Untill then it's just audio and amd an occasional 8 times blu light blink on my monitor

I've tried switching hdmi cables, from wallmart brand to monoprice premium certified, but nothing happens.

I've called marantz and told them that the issue starts happening when they've updated their firmware. I was told that the problem is not on their end, and it's probably pioneer's outdated firmware.

I've tried looking for pioneer support number, but i couldnt find anything for plasma tv, probably because the line has been discontinued for years now.

I'm not ready to giveup on plasma just yet.

I could really use anyone's help right now to point me to the right direction.