Install Keymap Editor add-on
Add-on:Keymap Editor - Official Kodi Wiki
and assign the right function to chosen remote button.
Guys, you need to live with this frame skip issue.
I thought it's gone in the latest update but after a day it's back.
afl1 is right. It's an overlay problem.
If you change the subtitles size to 14 the stuttering is gone but 14 is far to small.
The solution is to add a line of at the beginning of every subtitles. One line with normal font and one line with {y:i} marker because for some reason Kodi thinks that italic style is different and video stutters also when there is first italic line in subtitles.
The best way is just to accept that this problem is a part of Krypton.
kszaq mentioned many times that Krypton needs more CPU power than previous versions and the other thing is that Kodi team don't optimize code for Amlogic chips. Maybe some day they will.
I like Kodi 17 for one function: 1080p in YouTube using DASH and adaptive input stream.
The rest is a step back in optimization.
Waiting for Leia but my guess is it will be as sluggish as Krypton.
Hope I'm wrong!