Guys, i got a question about timing chain

Right now my car reaches 100k already, between soft cruising 80-100kmh, i will hear harsh noise from engine timing chain (1.8 Manual). Its like the chain is loosening and i need to press the accelerator so that the engine gain speed and its auto-tighten the chain and no sound of loosening when driven at 110kmh++

any of you having this problem?

Thanks.

white left too long can't sell become "elegant" brown d...