Problem: the miner sometimes stops

Reproducibility: reproduced more often with a pool difficulty of 6g than with a difficulty of 4g

Connection string: PhoenixMiner.exe -pool sp.whalesburg.com:8082 -wal {wallet} -worker test -proto 2

Environment:
OS: Windows 10 x64
Miner version: PhoenixMiner 4.0b
GPUs: Radeon RX570 x6

System error log:
The name of the failed application: PhoenixMiner.exe, version: 0.0.0.0, timestamp: 0x5bfebc7d
The name of the failed module: PhoenixMiner.exe, version: 0.0.0.0, timestamp: 0x5bfebc7d
Exception code: 0xc0000409
Error offset: 0x000000000030b7b8
Failure Process ID: 0xc88

Screenshot: http://prntscr.com/ly2dqf