Today, the rear wheel cum chain started making a weird clunky noise once in a while during my daily 20km trip back home. Towards the end, the noise got more apparent in the form of vibration felt near the foot pegs. When I got down and spun the rear wheel forward, it was getting kinda tight at one point and made that clunky noise. Spinning wheel reverse was smooth as usual.

I'm gonna take a look at the chain once the bike cools down now. Meanwhile, I'd like to know if these symptoms indicate some problem. Your help is truly appreciated!