Yeah but it's your location. I'm not surprised.
There's a few things I can suggest to try, you say it was working well on P1 until Wednesday when the system switch to P2.
You probably want to transfer the configuration to Sentinel before making any changes so you have it the way it originally was before we do this. You don't need to be connected to the internet.
Now on the radio itself...
I'm going to assume your site NAC operation in settings is on ignore. Go into settings and change it to use site NAC and back out of menu.
Go back into the menu to manage favorites, pick the favorites list the system is programmed into, go to review edit system, choose the system, go to edit site, choose site 031 or Lynchfield, go to set p25 NAC option, go to set p25 NAC, if it isn't already in there then put in 3A1h, press enter and back out all the way in the menu.
Make sure you are on ID scanning and not ID searching. Apply site hold to the to the Lynchfield Tower by using function Dept. Sit on talk group 501 which should have the Alpha tag troop L dispatch. Your control channel is 859.7625, is that there? How many bars are you getting? Are they steady or are they bouncing around? What is your RSSI and noise level?
I would also suggest if you have not already arranged it to get that cool antenna from Cheeseburgers. That just might give you the Boost that you need while in your apartment.