Plastic edging breaks

I have two of these plates bought earlier this year, due to the good Rezessionen.Nur one described the same Defekt.Ich thought, well an individual case.
I used one of them in a single household rather than an electric stove so cooking in daily Gebrauch.Das went very schnell.Ich was thrilled.
The first record was broken in May, the plastic got a horizontal crack between the display and Glas.Ich have complained about and Amazon credit bekommen.Danach I used the second plate which I had intended to be a reserve.
Unfortunately, here also, now after 2 months of use again in the same place, the plastic gets a bubble and warps down (I would melt. Also tell this record I will return.
The cooking properties were satisfactory and a simple use was possible. Unfortunately, it is apparently not to be used for everyday use.
Too bad, annoying and also not without risk.
Therefore, by me only one star.

I have taken up with the manufacturer by telephone contact but the clerk was not exactly human touch auskunftsfreudig.Es halt.
It would be the question of whether it is just a series having this defect
then the manufacturer would have to eventually start a recall.
I have in any case no longer have confidence in this product.