Remote issues are mostly simple — 70% of cases are batteries or interference. The other 30% could be Bluetooth module in TV or remote itself.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Remote not working — ranked from most to least common.
Weak batteries (most common)
Batteries installed wrong direction
IR sensor on TV covered or dirty
Bad Bluetooth module in TV (Smart Remotes)
Remote itself broken from drop
Interference from nearby devices (router, LED)
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.