Hello. I've been following this thread from it's beginning, but registered just a sec ago to leave a reply.
I installed this latest firmware update version 018.005.007.001 on my 55PUS6703/12.
For now update is available only via OTA from TV settings.
It looks like stuttering is finally gone, after my 1.5 year struggling with this.
I've tested external sources via HDMI (1080p, 720p and 4K) and internal sources like DLNA (1080p, 720p, 4K) and Youtube/Netflix. It looks like everything is fine now. At last. No more Monitor mode or Game Mode. Tested on Personal picture setting.
Here's changelist:
https://www.download.p4c.philips.com/files/5/55pus6703_12/55pus6703_12_fhi_pol.pdf
TPM186E_018.005.007.001 (Date published: 2020-03-24)
•Home/setup menuhang up/freezing issue.
•Game mode picture style setting not retained after waking up from standby issue.
•PatheApp Trailer playback freezing issue.
•Further improvement on Netflix error TVQ-PM-100 issue.
•Improvement on smart TV connection issue.
•TV switches sources unexpectedly with multiple HDMI CEC devices connectedissue.
Strange thing is that they only mention not remembering Game Mode setting after waking up from standby. No word about screen stuttering.
EDIT:
Did some more testing day after update. Unfortunately stuttering
STILL EXISTS...
But, remembering Game Mode setting after tv reboot is fixed. It looks like it's ONLY fix of stuttering...
Tested on HDMI source - Set Top Box @ 1080p.
Here's a slo-mo movie with stuttering @ newest firmware:
Visible between 10-19 sec - look at word KOREA under DZIŚ WYLĄDOWAŁ
Here's a slo-mo movie without stuttering @ newest firmware @ Game Mode setting after reboot: