Well first of all it's fine to set the temp manually in the tune menu after it starts printing the skirt or brim. It should stick with that temperature as long as there are no temperature commands in the gcode (which is extremely unlikely or you wouldn't be having this issue).
So on the UM2 the nozzle temp is associated with both the material and the nozzle size. For PLA, I think the defaults are around 210C for the 0.4mm nozzle and possible 240C is for the 0.8mm nozzle? Are you using a 0.8mm nozzle? The cura/um2 defaults work best for me with the 0.4mm nozzle. If you want to print with a 0.8mm you may have to override a few things.
Fixing this permanently is tricky. In the materials menu there is an option to write the materials settings to a file on the SD card then you can bring that to a computer and edit it with a text editor (like notepad on the pc) and fix the temperatures associated with your material (I assume PLA).
1) Are you using a 0.8mm nozzle?
2) Did you mention that you are using a 0.8mm nozzle possibly in cura?
3) If you look at the gcode file with an editor - near the top it should say the nozzle size that cura thinks you will be using. What does it say? That's where Marlin (the firmware inside the UM2) get's its information about what nozzle you are using.
thank you for your post. In order to help you I have some more questions for you:
Could you share a photo of your print, please? Do you have retraction enabled?
And are you able to tell us if that print had full default profile from Cura or did you make changes?
Have you always printed with PLA, or also abrasive/high temp materials?
Have you ever replaced any parts (like a TFM coupler or something?)
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