Boshhammer GBH 18v-20 lost power and smokes!

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Plumber / Heating, air conditioning installation
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I have a Boshhammer Professional GBH 18v-20 and was drilling out a 100mm hole in a brick wall when the power dropped to about half and the hammer action seemed to stop when pressure was added to the drilling. It still worked but took an age to go all the way through the wall.

ive tried using it again since and am stuck with pretty much half power and now smoke coming from the vents, hence I've stopped using it!!

I have practical but no technical experience with tools �� so am hoping someone here may have some idea what has happened and if it's fixable please?

it's roughly 4 years old so out of warranty....

Thanks in advance ����