changing filement halfway print

Greetings i have updated my firmware of my Ultimaker2+
Now i tryed printing with PC filement and pauze the print and put in new filement
it gets the old filement out fine but when i try to put new filement in it heats up and cools at the same time.
it will blink on the display cooling down and heating up and will not stop doing that. messed up 2 prints that way already

it is doing that with my PC filement and PLA
i wonder how i can fix this or is it a known problem and will be fixed soon?
i dint find it on the forum

Grtz Lex

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