Why Would Hot Water Arrive at Faucet Faster Than Before?
The first thing you can do is verify if the outgoing hot water pipe is hot or warm when you are not using hot water. If that is the case then you have a leakage somewhere.

You can also verify your watermeter. If you do not use any water then the meter should not move. If the meter rotates than you can be sure that you have a consumer, in fact an unwanted leakage somewhere.