Automatics run "cool" so coffee shouldnt be burnt in the normal course of brewing if all is ok.
As long as there isnt anything actually wrong with the machine, I would normally suggest it is to do with the set up of grind vs dose. This is where most auto coffee brew problems lie.
The automatic "group" could need service (as in a clean)...but that should be being taken care of by you running whatever cleaning cycles the manufacturer recommends. Im not 100% certain but I think the magnifica has cleaning cycles no....?
Other than that, yes it probably needs to go in for service.
You could ask a sponsor that deals in autos (and therefore understands them) if you can bring it to him and make coffee for him to try, to get a knowledegable opinion, but after that if it needs to go in it will need to go to a delonghi agent. Be aware that time is money especially if you ask a non delonghi selling sponsor to help.
very first CS site sponsor.