Need help with my Ender 3 V3 SE

Recently he has been causing problems, he starts to print cleanly and in the middle of the print there is no more filament I cleaned all new hotend on it but the error remains. The only thing I can see is that at the lower end of the bowden tube there is a thickening on the filament

V3 SE what bowden tube? Do you mean the one in the hotend? Replace it if is thickened it doesn’t like being hot for too long. Have you been printing TPU? That runs pretty hot.

My Ender 3 V3 SE doesn’t use a Bowden tube.

Same here I am wondering if the PTFE tube inside the heatsink upto the extruder is the part the poster is posting about.

A picture, if possible, would help with the description.