u sure your unit is from malaysia?
try hooking it to your computer and update it via NSU?

1. Many users still complain that their battery life has not been fixed even after 12070 update.
2. N9 wifi sensitivity is weaker than others but only a problem with marginal wifi signal. Not a problem in normal use.
3. Weak 3G performance? Never heard of this.
4. sms messages vanish - an isolated case. Never heard of anybody else having this problem. Those problems I mentioned with Lumia affect a large number of users and are reported widely.
5. Average camera performance - average is good enough. Those who want ultra camera performance should go for N8.
6. Limited apps - not a fault of the N9. Some users don't need a lot of apps. Let's not bring limitations and restrictions of WP7.5 in either.
7. Laggy when updating feeds - tolerable.

I don't agree with your conclusion that Lumia seems to work better. It seems to be rushed to market with serious bugs and production quality is below Nokia's high standard. Nokia subcontracted production of Lumia to a Taiwanese company.

you have wazapp installed?

Is it a cut microsim or original microsim? Have you tested it on another phone? If your sim is okay there is a possibility your sim card holder may be damaged. It's quite fragile.