[LG Optimus 2x] pulsation:
No unexpected shutdown for 1 week now

EDIT 1: I'm currently trying to use the stock battery again to see if shutdowns appear with it.

EDIT 2: With the stock battery, clockwork recovery will also reboot when buttons released.

EDIT 4: Using the stock battery, 1 BSOD occured after about 1.5 week of usage. Which is quite acceptable imho. So, I guess something software solved the problem, maybe the 0622 baseband as suggested by amateru. Cure may then take a few days to happen after flashing.

Wow, it's been 1 week since I did not experience any single unexpected shutdown!

Not totally sure about the particular thing that made it operate correctly at last. Anyway, I will summarize the steps so that it's not necessary to search the whole forum for my previous posts. Sorry for the redundancy, but I really hope it can help people, as unexpected shutdowns are a real pain for a phone.

First step: Trying another charger. I used a charger that has a lower current, as d4m4n just suggested. It helped a lot but did not stop the shutdowns.

Second step: Flashing Paul's MoDaCo rom (Vanilla for example). Helped too (reverting to stock rom was a disaster in step three). The work he did is wonderful imho. Thanks a lot. Anyway, even if the phone was "usable", the shutdowns did not disappear.

Third (useless) step: At the time, I really believed at first that LG would fix the bug as they claimed it was not hardware. Anyway, when I saw that their "2 weeks" lasted forever, I decided to send the phone to my operator's aftersales services. I even wrote a letter for them, stating that as the firmware and baseband were the last ones, it was certainly not a software problem. I was really surprised to see that even with explaining this logical fact to the seller, he had classified the problem as a software problem. About 3 week later, I had a phone call from the technical services. The girl on the phone explained that technicians didn't find any problem. Impossible I replied, it can't be charged for a whole day without shutting down. So I asked her to try to charge it for one day. Instead of this, I received a written statement from the technical service that I had agreed on the phone that the problem was not hardware. Congratulations. The seller explained that I should expect to have the phone sent again twice to the technical service to have a chance that the hardware would be fixed. I won't blame the operator for that, as I believe that all operators send faulty phones to the vendor's technical services, e.g. services agreed and driven by LG.

Fourth step: Disabling automatic clock synchronization. Using ClockSync at boot instead.

Fifth step: Updating baseband and RIL. (following links on http://xdaforums.com/showthread.php?t=1137032 )

Sixth step: Buying another battery. Something funny is that on the stock battery, the technical service stamped a sticker "good an healthy". Anyway, as for some other people changing the battery resolved the problems, I decided to give it a try for about 9€ on cellephone.de via the amazon marketplace - worth the time it would save before I have enough money or bonus to get an new phone I tought, if it could work by magic. I bought the 1300 mAh Li-Ion one, so I cant speak about the 2400 mAh Li-Polymer one. At first, when using this new battery, the phone became crazy and shut down about every 5 minutes. One charge later and after having "calibrated" the battery, it was a bit better, and it became better and better with time, even charging it in the car - that would have made the phone shutdown several times afterwards with the stock battery.

For now, my conclusion is that some shutdowns or reboots - typically those that don't need a battery pull out - may be software, and may be corrected by using a good rom such as MoDaCo ones. Some others may be hardware.

No need to say that it feels like having just bought a new, real, reliable and powerful phone. How great, because when it works well, the Optimus 2x is almost perfect - just a few lags in some applications like Appbrain. I really hope it will last and that my phone won't play anymore fool jokes, just like when my boss tries to reach me for example.