One thing to know is this printer has PTFE tubes in the extruders so any sustained temps over 235-240 will damage them. If you want to do certain types of materials you will need to go to all metal hot ends.

Ok, now! Whjat firmware version are you on? It will tell you on the display screen when you turn on the printer?

Also make sure to have the latest version of Flashprint. There have been good updates.