[Error] Instances stopped

[dataloaded]

I config "maximum number of pairs per instance: 10". My GUI maintain 6 gunbot instances. But after running for awhile, it's error. Detail:
2017-10-23 08:22:23: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-0):
2017-10-23 08:22:23: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-1):
2017-10-23 08:22:23: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-2):
2017-10-23 08:22:24: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-3):
2017-10-23 08:22:25: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-4):
2017-10-23 08:22:27: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-5):
2017-10-23 08:22:28: Gunbot failed to start (process: gunbot|gui|3.3.3+|config-6):

Any help fixing this problem would be great!
Thanks for the help

[dataloaded]

I found it turned off automatically after 60 minutes.
Please help me?