[SOLVED] Kodi flickers when navigating

[gkusiak]

changing the cable is the first place to start - the conductors (wires) are a very fine gauge because not much current flows over them. they can break rather easily if handled too much or in an aggressive manner

-BUT-

(and I would defer to @Nacheule 's better judgement on considering changing this, especially if you suspect the Pi's power supply might be out-of-spec)

the HDMI voltage output level from the Pi can be increased to compensate for the increased electrical resistance in longer cable runs:

https://www.raspberrypi.com/documentation/computers/config_txt.html#custom-mode

look under config_hdmi_boost

*** and tread lightly if you attempt it - you don't want to accidentally/unwittingly send a higher voltage down the cable than the HDMI port on your monitor/display can handle and destroy its circuitry ***

You shouldn't need to go this far: It's a last resort systemic tweak for only the most appropriate situations (and it could indicate the Pi itself may need replacing - how warm does the case/circuit board get? can it breathe and cool itself properly?)

check into your power supply first, and make sure it can send/is sending as much voltage&current as the Pi needs.
If that's not right, change that, and then look at the HDMI cable. Then, lastly, the actual Pi HDMI output.