It stopped with the following at the end of `debug.log`:
---
2019-02-10T15:18:11Z UpdateTip: new best=00000000000000249597632a2fe08578cd1d2c0f620342ca91c3611786fe464f height=232591 version=0x00000002 log2_work=69.838772 tx=16550595 date='2013-04-22T14:31:02Z' progress=0.044502 cache=597.4MiB(5216340txo)
2019-02-10T15:18:12Z Error: Out of memory. Terminating.
---
I rebooted the raspi and it went straight to recovery mode... I will start from scratch again and do the hardware checks mentioned above.
Try follow Pieter Wuille advice at
https://bitcoin.stackexchange.com/a/50743, the one who ask the question also use Pi, so it should able to fix lack of memory problem
If it's still doesn't fix your problem, you could try using pagefile/file-swap as last solution