I posting this as different post, because many people have this issue and comments are usually answers with: "Yea me too". So technical answer is and all credit goes to reddit user backseat-driver:
"Short answer, disable HDCP, if the flicker disappears get a new cable.
A bit longer answer...
HDCP (High-bandwidth Digital Content Protection) a form of DRM (Digital Copy Protection) which is used to prevent the copying of audio and video content that travels in a HDMI cable.
For HDCP to work, both ends needs to be HDCP compliant, if there is a receiver or a switcher of some sort in-between, it needs to be HDCP compliant as well.
HDCP works by sending a handshake including a key between the compliant devices, if one of these handshakes would fail there will be a momentary no signal (black screen/static). Depending on the devices themselves and how many of these handshakes fail, the output can be a bit different, such as it starting to flicker or only audio cutting out.
Sometimes there can be interoperability problems, which can make two compliant devices not work well together or at all because of improper implementation of the HDCP protocol. It can also show itself as working when turning the devices on in a specific order, and failing when started in another order.
Unplugging the power cords on offending HDCP devices can in some cases (temporarily) fix a HDCP issue, exactly why I can't tell as my knowledge about what happens inside the electronics is not good enough.
Often it has to do with a cable going bad, which can be hard to troubleshoot without knowledge about HDCP. The same cable might work with other devices, but likely it does so because the other device does not use HDCP or a different version (or implementation) of it.
Specifically on the PS4 one can disable HDCP, which is a good way to troubleshoot if the problem has to do with HDCP.
I hope that answers your question."
Now I will expand on it. Don't get any hdmi cable, get premium certified hdmi cable. And no, not in a name " premium hdmi gold plated 4 times twisted kissed by mermaid made in top secret lab with a help of Stephen hawking" hdmi cable, but it have to have hdmi premium certification.
Honestly hdmi basically f***ed whole consumer base for hdmi cables naming new standard premium, because everyone and their mother markets their hdmi cables as premium for the last 10 years.
So that is this premium certification? It proves that cable have bandwidth to stream signal at 4k 60fps. Where is very few cables on a market with this certification so be careful when buying it, make sure it is certified. I'm on mobile, so for more info just Google hdmi.org premium certification. I got it myself and signal dropping ALMOST dissappeared. It isn't perfect, but it gone from every 10-20min to maybe once a day.
Also, it might not work if you don't plug in your cable from ps4 to TV directly but use some box in between.
And if it's not HDCP or hdmi bandwidth problem and none of those two fixes help, when you out of luck, because I can't help you.
Also also, remember disabling HDCP your Netflix, YouTube won't work. You have to enable it again. Honestly blame Sony for not auto enable HDCP when entering drm content, because xbox does that easily. It is a lot of rockus if you use your ps4 as streaming box.
Where might be more, so smarter people than me could help in a comments, so read them.
Also, also, also I saw few people write about deep color function being disabled helped them with flickering, some one with more knowledge explain it in comments.
OK, algiuz out.
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