I think you want something quick and dirty just as an experiment, to investigate your issue, not a permanent VPN solution which you shouldn't even need.
If you can recreate the streaming issues on an android/ios/mac device then SurfShark offer a 7-day free trial. You use their app and you have to give them your card but they don't charge it for 7-days so you can cancel before then, and even after that there's a 30-day cancel period.
I've used IPVanish too, which has no free trial but does have a 30-day cancellation period.
Having used both of these in the past, I found IPVanish better performing.
Those are the only two I used.
Depends how you feel about signing up for things and then cancelling later I suppose.