pi zero w with camera powers off after couple of hours

[weisia]

I have a raspberry pi zero w with a camera and want to use it as a timelapse camera. Problem is that after a couple of hours (sometimes 75 minutes, sometimes two hours), the pi shuts down. My initial setup was a pi zero with a 16GB card running JessieLite. Figuring maybe the board was faulty I got a new zero w and put a 64 GB card in it (Raspbian Jessie done with Etcher).

The script for the timelapse runs without error. I wrote a script to check every minute on the temperature and voltage, and that was fine too. In the syslog, messages and debug logs I can't find any indication what causes the sudden poweroff. Trying to figure out the problem I swapped the adapter, the sd card, usb cables. The power adapters have an output of 5V and 2.4A and 2A each. The pi is connected both by ethernet and wifi.

It used to work, so I am overlooking something. Can anyone point me to the right direction?

EDIT: in the logs there is one part in red

Code: Select all

[   95.619729] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43430-sdio.bin for chip 0x00a9a6(43430) rev 0x000001
[   95.620217] usbcore: registered new interface driver brcmfmac
[   96.049986] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Oct 23 2017 03:55:53 version 7.45.98.38 (r674442 CY) FWID 01-e58d219f
[   96.052405] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2 Data: 7.11.15 Compiler: 1.24.2 ClmImport: 1.24.1 Creation: 2014-05-26 10:53:55 Inc Data: 9.10.39 Inc Compiler: 1.29.4 Inc ClmImport: 1.36.3 Creation: 2017-10-23 03:47:14