hashcat stops after about 37 minutes

[patpro]

Tested hashcat-3.6.0%2B413.7z. But problem remains:

Code:

Status...........: Exhausted
Hash.Type........: sha1($salt.$pass)
Hash.Target......: 91b71745d8094a10a86171...:474387411
Time.Started.....: Wed Aug 23 22:09:48 2017 (34 mins, 51 secs)
Time.Estimated...: Fri Aug 25 08:21:13 2017 (1 day, 9 hours)

"exhausted" after ~34min on a +33 hours run