Call keeps dropping due to off grid when lot is not off grid

I have been having the same issues.  My current game is in Sulani and I've noticed this happening on three different lots - none of which have ever been off-grid.  I noticed it since the last patch.  (So, they  fixed fishing so my sim can make money, but broke the phones so now their lonely all the time....)

BTW, I play w/ CC & mods but tested this by taking the mod folder out completely and played for a while.  Same issue