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Obecně k tématu vyrovnávací paměti - tedy hlášení z Kodi ,že je plná.
 Narazil jsem zcela náhodou na komentář jednoho týpka na youtube(kde se řešilo jak ji uvolnit) ,který to popsal úplně přesně co to znamená a vzhledem k tomu ,že tady tuto odpověď nevidím tak to sem postnu ,aby někdo (jako já) až bude hledat info vo co go ,tak aby tu našel možnou odpověď.

The video cache works by saving a few seconds of video before it is needed, so that if there are small slowdowns or bumps in loading the video, it will not constantly pause while waiting to get enough data to resume playing back. The video cache is normally stored in RAM and erased on the fly, as needed. It requires no user intervention to "empty" this cache. A warning about the cache filling up does not actually mean that more cache space is needed or that the existing cache needs to be emptied. The warning box is not currently well worded and has lead to a lot of confusion with users. What it means is that the video is loading too slowly for the cache to smooth out all of the bumps, and that the bumps will keep happening due to that low video speed. Kodi only uses a tiny amount of RAM for the video cache, about 60 MB. This is because Kodi is not currently coded to see if the hardware you are using has more or less RAM, so to be safe only a small amount is assumed to be available. Users are able to increase this amount, and modify how "quickly" it fills up, by following the guide at HOW-TO:Modify the video cache. However, changes to these settings are only helpful for a few situations, such as a network that fluctuates in speed, occasional wifi interference, or a connection that is borderline too slow for video to playback.
Note: No amount of video cache tweaking will make a slow server connection any faster, which is a common issue for people who stream over the internet. Even if you have a fast connection on your device, it doesn't matter if the connection on the other end is slow. The server itself might not always be slow, but might be more busy at different times of the day.

Jestli to dobře chápu ,plyne z toho (zjednodušeně) že problém není v Kodi ani v hardware ,ale je to pouze o tom,že je pomalý ten streamovací server. Jak to známe ze "stahovacích" serverů typu Uložto apod. Zkrátka někdy to jede na plnou rychlost někdy ne. Třeba je přetížen apod. Takže to zbytečně neřešit ,nebláznit a netřeba nikde nic v Kodi upravovat.