I have terrible signal strength at work and often completely lose cell reception. Ever since I've updated my Samsung Note 3 to 5.0, whenever I completely lose cell signal for hours and I go outside, my phone will not pick up the mobile network again. It's stuck at the "Searching For Service" part. I have to restart my phone and I'm immediately back on the mobile network. On 4.4.3, it would pick back up in a few seconds once I step outside.