I feel for ya, really its sucks getting kicked without warning for something sort of out of your control. I do have to ask, however, why haven't you started on your defender? It is arguably one of best subclasses in PVE.
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I started on striker because it defaulted to that. I didnt know anything about subclasses until one of my friends told me to level defender. It may be the same situation but we ran 2 defenders and a sunbreaker. Its really all in how you utilize you subs. Didnt deserve a kick but at least give them advice before you kick so they understand why you kicked them.
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Not leveling up your subclass is completely in ur control