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The obvious first question, have you changed anything in your setup since calibrating PHD2? My first port of call would be to re calibrate. The only time mine has behaved like that was when I made some changes that resulted in a change of the guide camera angle and I got ties up and forgot to re calibrate, it guided ok'ish until a whiffle of wind moved the scope a bit then it ran away like that as the guide corrections were not actually moving the scope in the direction PHD expected. While the corrections were tiny (Probably actually chasing the seeing more than the mount) it was more or less OK but when it put in it's first sizable correction off it went just like your graph.
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