What exactly do the WLAN bars indicate?
Being very close to the AP (a MiFi device) I see normally all 4 bars lit up. For whatever reason this indicator drops sometimes down to 2 bars and my Internet connection stops to work. After about 10-20 seconds I can see the full 4 bars again and my connection is good again. I wonder if this is a problem with the MiFi device, interference from other APs or my Jolla phone. Do the bars indicate signal strength, bit error rate, or anything else?