I have been running Kodi 17.4 and firmware 2.0.5 on a daily basis since it was released, with no adverse behaviour (playback from HDD & NAS, not Kodi streaming). It plays everything I want it to (mainly 1080p Blu-ray rips or remuxes and 720p TV series).
I'd recommend you try updating your system to the latest versions and see if it works for you?