Troubleshooting bluetooth

I have a Redmi 5 plus with global MIUI. I use a JBL T500BT for like, 1.5-2h a day with it.
I been using it for like a year now.
Some weeks(2-3) ago my music started stuttering sometimes, like its some interference on bluetooth, it happens for 5-15 seconds, when using this headset. How can i troubleshoot this to know if its the smartphone or headset that have the problem? I dont have other phone or bluetooth headset.