I don’t think it is related to the cable, since the box is not being moved, but it keeps rebooting. Here are some logs from the past day highlighting reboots:
Sat Mar 25 01:04:57 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:378,”cpm”:18,”temperature”:30.25,”uptime”: 5831}}
Sat Mar 25 01:05:17 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:376,”cpm”:0,”temperature”:30.25,”uptime”: 14}}
…
Sat Mar 25 01:11:00 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:378,”cpm”:17,”temperature”:30.25,”uptime”: 358}}
Sat Mar 25 01:11:35 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:377,”cpm”:0,”temperature”:30.25,”uptime”: 15}}
…
Sat Mar 25 02:32:26 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:378,”cpm”:14,”temperature”:30.25,”uptime”: 1026}}
Sat Mar 25 02:32:53 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:376,”cpm”:0,”temperature”:30.25,”uptime”: 15}}
…
Sat Mar 25 07:06:59 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:379,”cpm”:10,”temperature”:29.50,”uptime”: 843}}
Sat Mar 25 07:07:26 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:376,”cpm”:0,”temperature”:29.50,”uptime”: 14}}
…
Sat Mar 25 12:19:17 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:378,”cpm”:22,”temperature”:31.00,”uptime”: 719}}
Sat Mar 25 12:19:52 EDT 2017
{“data”:{ “id”:”11000103″,”type”:”1″,”detector”:”SBM20″,”voltage”:376,”cpm”:0,”temperature”:31.00,”uptime”: 16}}

It doesn’t look like it can stay up for more than an hour, on average.