Do you have any dizzy or nausea spells? Are you taking any beta blockers or other meds that would lower your HR? If you have symptoms, it’s really something to check out.
After my heart rate settled post MVR (was probably a year), it’s regularly in the 50’s at rest and upper 40’s while sleeping. My cardiologist is OK with it as I have no symptoms. A few years back I had a cholecystectomy and was inpatient for 2 nights for heparin bridging afterwards and one night 3 nurses came running in and scared the crap out of me. I woke up startled and they said my HR went down to 28. My response was “I was sleeping, what’d you expect?”. I was their annoying patient. I’d do things like take a long walk around the hospital and would go out of range of the telemetry.