I might be able to shed some light on this issue.
I have a Panasonic Z95A Oled and since either the January or February firmware update my TV has had a stutter while playing back ANY UHD HDR HLG content from my SKY Q Box. This includes SKY movies, SKY TV programs like House of the Dragon and any APPS when used on the SKY Q box that are in 4K HDR e.g. the latest series of Clarksons Farm. NON HDR content from APPS works fine.
I Spoke to Panasonic UK in mid March and had a visit from their approved service centre that replaced the "Main Board" within the TV.
Starting the TV and following the installation instructions but NOT connecting to a network the TV started up on firmware version RS8112/2363 and ALL HDR content worked perfectly with zero playback issues at all. Problem Fixed? Err no!
Plugging the network cable into the back of the TV immediately triggered a firmware update to version RS8130/3200 (the latest) and the stutter was back. VERY ANNOYING!
Two new certified 48GB HDMI cables later and the stutter remains
I have, fortunately, access to a friends SKY Q box which works faultlessly on his Samsung TV but displays exactly the same stuttering issue on my Z95. My SKY Q box works perfectly on my six year old Panasonic GZ950B HDR OLED TV. It's definitely not the SKY Q box thats at fault.
Having spoken to Panasonic UK again, they have now opened an Incident case for this issue for which I am awaiting a reply.
if you are having this problem please ring Panasonic UK Customer Helpline and tell them, although they must be aware of the issue by now.
Sorry it's a long post but hope it helps.
