I too am facing the problem of having to restart the SP3 to get the wifi connection and also the bluetooth mouse, because seemingly both wifi and bluetooth connections disappear upon waking up from sleep.
I've had no Wi-Fi issues. Well, I thought my Wi-Fi speed was slow, but then realized I had a phone, TV, two laptops and the SP3 all connected to the Wi-Fi. Disconnected everything but the SP3 and then my Wi-Fi speed was fast!
The only Bluetooth device I have is a speaker and it was a little finicky at first, but now it connects fine and stays connected.