MacBook Pro has started to randomly stop when it is on battery since the upgrade to El Capitan

I have a MacBook Pro (15 inch, early 2011) which works very well on the Mountain Lion for a long time. I finally got round to upgrading to El Capitan last week: directly to 10.11.6. A few days later he just powered down without warning while I was working. He was so very well for a few days, but then made several times in the last 48 hours.

I am moderately sure it happens only when it is on battery (it did not in the past hours 8 while that plugged). Whenever it happens, that there is no warning and the Mac then fine restarts (manually) - Although the clock resets always in 1970 until he can contact an NTP server. One of the curious side effects is that my PostScript fonts were blank on the screen in Excel for a few reboots yesterday but then OK once again!

No hardware has changed. Major software change is only El Capitan and possibly an iStat Menus update.

I have reset PRAM and SMC. I ran the short AHT. I disassembled the machine and clean the fans. they were OK, but the problem seems to occur when the Mac is hot.

Spotlight and Time Machine sometimes seemed to be struggling for the upgrade, and I also saw rpcsvchost with 100% of a core for a while. The machine feels sometimes slow - but for the last 8 hours, it was very good. The only model that I put in place, is that it seems to occur only on battery; It's even happened then that the Dock (etc.) were loading after logging in after an unexpected shutdown.

The other thing common is in the newspapers every time:

Cause of previous stop:-128

I scanned a number of related posts to aspects of it, but do not look at who blames El Capitan rather than material. Yet, many people reported this kind of problem after the upgrade... Coincidence?

Any ideas?

Thank you.

Cause of previous stop:-128

A negative stop code generally indicates a hardware failure. Have the Apple to assess your Mac. The fix may be as simple as a spare battery.

Start here: contact support

Tags: Mac OS & System Software

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