Taptic Engine stopped working on my iPhone 6s

One fine day, the Taptic engine on my iPhone 6s decided to stop working. The phone is being used normally and there was no mishandling, dropping, jerks/shocks to the device or exposure to moisture/liquid. This has happened previously a couple of times, where restarting the device has generally resolved the problem, but not this time. It has been around 4-5 days and the Taptic engine simply won't give any feedback when force touching an app icon, receiving a call etc. I have tried restarting the device multiple times, and have also reset the device entirely, but to no avail. I am running iOS 12.1.4 (current as of this writing). How do I resolve the issue?