Phone calls drop out during office hours but seem to be fine after hours.
Calls drop every few minutes when calling out or receiving calls.
When calling out after the call drops it shows call failed.
I have 3-4 bars reception and do not see it go any lower.
I have restarted my phone multiple times and re-seated the sim card.
Welcome to the Community!
Aside from rebooting the phone and re-seated the SIM card, have you tried to select manually a network?
If not, please try it as well, then reboot the device before using it.
Is the mobile data was turned on when you used it to call out or receive calls?
Have you tried using a different mobile phone to confirm if it's the SIM or signal issues?