Hi tiger,
A very common mistake while cornering is stepping on the clutch. This is like putting your vehicle into neutral and thus gives you less control over your vehicle. While cornering, try to practice downshifting so that you have more control over your ride.

Dati rin ganyan ang gawa ko, but after some close calls, I realized that its really better to downshift nalang and turn while on 1st or 2nd gear.

As for the noise, its probably the release bearing.