Restore value is greater than keyspace

Hello everyone, can anyone point me on how to solve this error? It just happened without any user intervention. Cannot resume either, fails with same error.

(...)

Session..........: sip1
Status...........: Exhausted
Hash.Type........: SIP digest authentication (MD5)
Hash.Target......: $sip$*(edited)
Time.Started.....: Mon Jun 11 16:03:56 2018 (2 secs)
Time.Estimated...: Mon Jun 11 16:03:58 2018 (0 secs)
Guess.Mask.......: ?d?d?d?l?s?d?d?u [8]
Guess.Queue......: 134/40824 (0.33%)
Speed.Dev.#1.....:   964.2 MH/s (7.76ms) @ Accel:32 Loops:31 Thr:256 Vec:1
Recovered........: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.........: 2230800000/2230800000 (100.00%)
Rejected.........: 0/2230800000 (0.00%)
Restore.Point....: 2230800/2230800 (100.00%)
Candidates.#1....: 293d-31Z -> 688q~49Q
HWMon.Dev.#1.....: Util:  0% Core:1258MHz Mem:2000MHz Bus:8

Approaching final keyspace - workload adjusted.

Session..........: sip1
Status...........: Exhausted
Hash.Type........: SIP digest authentication (MD5)
Hash.Target......: $sip$*(edited)
Time.Started.....: Mon Jun 11 16:03:59 2018 (6 secs)
Time.Estimated...: Mon Jun 11 16:04:05 2018 (0 secs)
Guess.Mask.......: ?d?d?d?l?s?d?l?u [8]
Guess.Queue......: 135/40824 (0.33%)
Speed.Dev.#1.....:   908.9 MH/s (8.00ms) @ Accel:32 Loops:31 Thr:256 Vec:1
Recovered........: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.........: 5800080000/5800080000 (100.00%)
Rejected.........: 0/5800080000 (0.00%)
Restore.Point....: 5800080/5800080 (100.00%)
Candidates.#1....: 293v+1mQ -> 688q~4qC
HWMon.Dev.#1.....: Util:  0% Core:1253MHz Mem:2000MHz Bus:8

Restore value is greater than keyspace.

Started: Mon Jun 11 15:45:37 2018
Stopped: Mon Jun 11 16:04:07 2018

Command Line used was:
hashcat64 -a 3 -m 11400 -D 2 --session sip1 sip.txt masks\8char-1l-1u-1d-1s-compliant.hcmask

hashcat Version: 4.1.0

Thanks!