1- YES MULTIPLE TIMES!
2- its something like this, look at the pictures 1 & 2, picture 3 is when my connection is working normally with a cable.
3- the mode/WiFi router that i have only uses the 2.4 GHz band so yes.
4- i did, and my connection kept working fine. i don't know why!
basically my DSL connection that keeps restarting all the time.