Mazda Repair Questions? Ask Mechanics for Answers ASAP
How many miles now?
Do you rev the engine now and then?, they are meant for that.
Does it still have the normal power above 2500, to 7000?
It does sound more like a sudden low speed issue.
Does the engine light come on while driving?
No engine light should ever be ignored, since you wouldn't know if a new fault occurs.
I would find another mechanic now.
Sounds like it has a low compression rotor housing.
The engine and engine needs to be inspected for compression loss, and what codes are set.
Hope this helps.
The rotary engine is a great performance engine, but alas they have a short life.
And can't meet current emissions standard, hence why Mazda stopped production.
Hope it all works out for you.
I hope my advice has been of assistance to you.