Check the log if it detected a decoupling and simply turned it off for that reason. That you can adjust extruder settings to handle this better. Default values do not work on all extruders. Some swing more, others heat slower. So you might just need to adjust decoupling variables accoring to log message you get when it happens.
Clogged extruder is not automatic cooling down when target reached, so that problem is gone?
There are many reasons for clogging, so hard to say what it was. Typical it is filament melting to high up blocking extrusion. Sometimes cheap filament has small garbage blocking nozzle. In any case clean up nozzle and check manually if you can push filament through the nozzle. This is also a good test to find the correct temperature as you feel how much force it takes.
What are you extruding? Most extruders are defect at 400°C. PLA prints at 180-200°C. Our default maximum temperature is 275°C for that reason. Exceeding max. temperature turns extruder off.
If doesn't melt even at 280 and you know it's not clogged, you probably have misconfigured the temp sensor. Also, does your PTFE tube go down all the way to the nozzle/heatblock? If so, it's not all metal and you should never exceed 240-245C. Past that temp, PTFE starts to deform and melt and not only will it clog, it'll also produce some nasty toxic fumes. Don't trust the Chinese hotends.
P.S. After you try to extrude some filament, pull out the filament, does the end look like a plug? Do you have a fan on your hotend's heatsink?
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Also, does your PTFE tube go down all the way to the nozzle/heatblock? If so, it's not all metal and you should never exceed 240-245C.
Past that temp, PTFE starts to deform and melt and not only will it clog, it'll also produce some nasty toxic fumes.
Don't trust the Chinese hotends.
P.S. After you try to extrude some filament, pull out the filament, does the end look like a plug? Do you have a fan on your hotend's heatsink?