a mag issue would cause FTFeed, would be less likely to cause FTE. but its possible. stop running the 17rnd mag and see how it goes. also contact ruger they have wonderful CS. if its the ejector, or the mag. they should be able to send you new replacement parts.
I have been a silent witness
to all of America's finest hours.
But my finest hour comes
when I am torn into strips and used as bandages
for my wounded comrades on the battlefield,
When I fly at half-mast to honor my soldiers,
Or when I lie in the trembling arms
of a grieving mother
at the graveside of her fallen son.