escorts shadowing me?

[sideways]

hey gang,

i'm getting a really weird issue.

i took the mission off the east coast of england as the first mission, and managed to sink a couple of freighters without getting pegged by any DDs, but now I have a destroyer escort following me everywhere I go. Doesn't matter if I change direction while well out of his visual range, if i sit deep and silent for half a day, no matter what evasive action i take, he mimics me perfectly.

what makes this even WEIRDER is that if i turn to face him, he turns to the exact same bearing as me and matches my speed, so he maintains a near constant distance from me no matter what i do.

it's like he's playing with me, trying to pretend he can't see me, but mimicking me perfectly

anyone else got this one?