I'm a studying in Singapore and just bought a laser pointer from a China website and it got the mode hopping problem. Replace or refund is not allowed.
So I'm wondering anyone can help me to fix it in Singapore.
Unfortunately, the only fix is to use a duty-cycle or to replace the module inside with an o-like green module. Either way is more expensive than just buying a new laser from DX or something like that. As long as you stick with lower powers, getting one that mode-hops will be less likely.