Raspberry Pi 3 – OpenELEC MKV buffering issues (newb)

I’ve been having some buffering issues on my Raspberry Pi 3 with OpenELEC the past 6 months.

Both the Pi and Ready NAS 104 are setup with a wired connection to the router and for some reason I’m having major buffering when watching MKVs recently. I never used to have these issues and lately it’s been happening with every MKV. It’s getting to the point where we can’t even watch the MKVs and have to turn them off.

Please let me know what kind of details you need as I’m not sure what’s exactly needed to solve this problem. Thank you in advance!!