I suggest this with all router connection problems only cause I had the same experiance and did this and it fixed everything. Try to 30-30-30 router reset.
1) unplug your router.
2) hold down the reset button for 30 seconds.
3) while plugging the router in hold reset button down for another 30 seconds.
4) it should blink a few times letting you know it reset. Then again hold down for 30 seconds.
That should fix all your problems