Problem while printing with A1 0.4mm

[IBB]

Hello. First of all, sorry for my english

Since today in the morning without any reason, all my works has a big issue. First off all, the silicon cape that cover the hotend has a crutch with a piece that was printing in the bed and has a bad adhesion.

From this moment, all works was ruined for differents causes.

I try to put another silicon cape, put the same hotend again (0.4mm), calibrate the printer a lot of times, try with differents and similars PLAs.

Same issue. I dont know how can I resolve this problem.

The printer is at the same place that always and without changes from my. AMS is over the printer.

I need to cancel all works because at the second or third layer the hotend destroy the piece.

These some photos for the calibration (1 and 2 layer at slow velocity ok, but when the speed increase, the layer was horrible).

Thanks to all.

[BambuBanker]

It looks like your fan is off or broken

[IBB]

thanks for the answer. My fan is off on the first 5 layers.

anyway, I do a printer hard reset, use the pla bambulab profile for all my filaments and use the standard settings. Too change the z hop value for 0.8, cross hatch fill and i think all works fine again.

but why happend this malfunction if always works fine?

Thanks!