I had a small hardware shop unlock a Rogers Samsung Galaxy S7 (SM-930W8) and many things have straight-up stopped working. Keyboard, back and recent apps vibration feedback is always weaker than usual. I have already factory reset this phone 5 times out of frustration now, and have tried to also back up a phone from Smart Switch, but all Smart Switch is giving me is a "Failed to connect to device, the connection to this device has timed out." Another difference from before and after is Knox giving me a Security notice, details are "Unauthorized actions have been detected." When I tap the notification, it brings me to the Device security part of Settings, and says that there is a Threat found and I have to restart the phone to undo any unauthorized changes, upon restarting the same error appears in the notification pane everytime I try this process. I have also noticed unexplained slowdowns while launching apps and hitting back and the phone actually doing something. Yet another thing I have noticed is that the phone does not seem to remember any WiFi connections that I connect to and takes excessively long to turn on WiFi and excessively long to connect to any WiFi connection. Another different thing that happens is whenever I reboot the phone, a process called "LoggingService" always crashes. There are still several issues I have noticed, and it's only been 3 hours since unlocking the phone. The device is not rooted.
