motor stops when hot

Hi, For a few days i got a strange problem like; When the motor goes hot, specially in first movement it stops working.For ex in the first move at traffic lights.. Or when up or downshifting.. No CEL or warnigns.. I got a stratus 97 2.5 V6 with automatic trans. Actually the problems started after changing thermostat and i wonder if it is about that or not?

Can it be a headgasket or sensor problem also?

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gobris
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