Kodi 17.3 Subtitles cause video playback stuttering

Hello,

Since Kodi 17, all video files start to stutter when subtitles are enabled.
The stuttering occurs every few seconds or less, irregularly. The pause is for less then a second each.
With Kodi 16, there was no issue at all.

More info:
– local video files
– srt subtile files locally stored (I have not tried with other formats, yet)
– Win 7 system
– Kodi 17.3

I already tried:
– Changing subtitle font
– enabling/disabling video hardware accelerations
– searched the whole internet for a solution 🙂

Thanks already in advance for solution proposals,
Chris