Probably it's related to Widevine, the latest version it's known to cause such issues. Downgrading Widevine to 4.10.2252.0 should fix it.
Personally i used SlyGuy Common addon (use google to find it), it's very easy to downgrade Widevine with thay.
Thanks @Pretorianl I'll try thah an comment here the result
Well...
I tried to install the repository that Pretoriano mentions but it gives an error when trying to install the zip file.
But...
I found on this site issue 1323 information on how to replace the winedive library version and it worked 
Here adapted to LibreElec:
wget https://k.slyguy.xyz/.decryptmodules/widevine/4.10.2252.5-linux-armv7.so --output-document /tmp/libwidevinecdm.so
cp -a /storage/.kodi/cdm/libwidevinecdm.so /tmp/libwidevinecdm.so.bak
install /tmp/libwidevinecdm.so --preserve-timestamps --owner root --group root --mode 0744 /storage/.kodi/cdm/libwidevinecdm.soI had no issue installing that repo.
However, i'm glad that you solved the problem.
When I get video lags, I restart raspberry Pi and it helps... Have no idea why
When I get video lags, I restart raspberry Pi and it helps... Have no idea why
Did you downgrade widevine as mentioned earlier. Latest widevine is known to cause lags.
I also experience strong video lagging where sequences are skipped if the sync of audio and video gets to large. I followed the instruction of @gabriel_tandil but it did not work on my Raspberry 3 using LibreELEC-RPi2.arm-11.0.1.
I tried the mentioned shared library and the newest:
wget https://k.slyguy.xyz/.decryptmodules/widevine/4.10.2252.5-linux-armv7.so --output-document /tmp/libwidevinecdm.so
wget https://slyguy.uk/.decryptmodules/widevine/4.10.2557.0-linux-armv7.so --output-document /tmp/libwidevinecdm.soAny suggestions? Thanks!
Widevine in Plugin castagnait-2.0.0 for Raspberry 3 LibreELEC-RPi2.arm-11.0.1 is very slow or is lagging very much. I rolled back to Widevine in Plugin castagnait-1.0.0 for Raspberry 3 LibreELEC-RPi2.arm-10.0.4.
