Samsung Galaxy Note 4 eMMC read error temporary fix
Update 10.02.2019: This is just a temporary fix! After a week my phone got random reboots and sometimes lag. A permanent solution would be to reflow/reball the chip.
Do not attempt this if you don't know what you are doing! Some people damaged their devices trying this repair method, so be careful!!
In my case this method resolved the mmc read error, random reboots and no charging problem that I had with my Note 4. Also, the phone now works at normal read-write speed.
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Some info regarding this problem:
"Many consumers who purchased the Samsung Galaxy Note 4 are complaining that it suffers from a fatal defect in its memory chip, which leads to the dreaded “mmc_read failed” error. Once this defect manifests, the phone will frequently restart and fail to boot, and ultimately become inoperable. Many Note 4 owners are using the Wake Lock app as a temporary band aid fix, which appears to buy time before the memory chip completely fails, at the expense of additional battery usage." Source: http://www.classlawdc.com/2017/04/25/...