Your country does not discuss "problems" of its jets in public.
On the other hand:
A Chinese named Su Bin once led a successful multiyear effort to steal design plans for America's stealth fighters.
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F-22A Raptor is a true 5th gen fighter that was very costly to produce. It is not a cheap clone or a look-alike. The US never shared F-22A tech with any country. However, F-35 program has helped reduce costs of 5th gen parts and research 6th gen concepts that will inform development of NGAD. In case you wondering, the US is testing 6th gen prototypes as we speak. The US started researching and developing stealth aircraft in the 1960s and no country is close to its level of expertise in this domain. You need to calm down and respond maturely.