Neck/Shoulder pain

I'm not sure why it happens, and no matter how much i stretch out before a run, after 9 miles or so i get a real bad ache/pain in my left Trap muscle right by the shoulder blade, its sometimes quite painful.

i run 70% off road so i put it down to looking down as i need to watch the terrain a lot more than road running, but it seems to be affecting me on road runs too,

anybody else have this issue? any ideas how to get around it?
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