If I try to watch a YouTube video on any computer, I lose internet.  The IP address for the computer I am using gets blocked under "Blocked DoS Host List".  It happens on both Win 7 Pro computers and my Win 8.1 laptop.  Both my Android phone and tablet work fine.  I have had the router since November.  These are the original settings.  This started about a month or so ago.

Also, about 3 months ago, I can't touch the router.  I mean that in the literal sense.  I can't physically touch the router.  If I do, it shuts off or I lose internet all together (the internet light changes from green to orange).  It can take many off-on cycles for it to work.  It either turns itself off after it goes through the boot up cycle or the internet light is orange if it fully starts up.

Any ideas mainly on the YouTube issue?  The second issue is also a real annoyance, so I try my best to just stay away from the router.

Archer A9 AC1900 router

SPI Firewall - On

DoS Protection - On

ICMP, UDP, and TCP-SYN settings all set to "High"

Ignore ping packet from WAN port - not checked

Forbid ping packet from LAN port - checked