I've a problem with a dongle on a raspberry 1 running the latest raspbian.
Everything works ok, the signal is very good, but i lose wifi link a lot of times during the day and it connects again after some time (may vary from 5 mins to 1 hour).
The power is ok (using a 2.1A)
The raspberry don't reboot, it's still up and running (i'm sure due to a debug led i've connected to a gpio pin).
Any idea? I've disabled the power manager and i'm not running any sort of X desktops.