First of all, it started to happen as I bought fr220 instead of old fr910. Garmin Connect was installed long time ago. So I paired fr220 to my phone and this bug appeared.
While bluetooth is switched off on the phone, wi-fi works as usual,
as I switch bluetooth on, internet connection through wi-fi fails, i am in the network, but no connection.
as bluetooth is off, connection is back again.
my temporary workaround:
wi-fi off
LTE on (if is off)
bluetooth on
sync my fr220
bluetooth off
wi-fi on
to use bluetooth and wi-fi simultaneously I have to kill the process Connect.
I have Sony Xperia Z1 C6603 with Android 4.4.2
Did someone have similar trouble?