Amazon Fire tablets sometimes become corrupted and start behaving strangely. If you tablet can no longer connect to your laptop, even though "adb devices" shows the device is connected, this may be the cause.You may be able to correct the problem by doing a hard reset of the tablet:Exit any apps you're running.Press and hold the power button for 40 seconds. Even after the screen goes blank, keep pressing.Release the power button.Power the tablet back on again.This will not erase any of your installed apps, but does seem to be effective at curing strange behavior.