I have a Windows 7 VM and set the network to Default Adapter. Everything works. Sometime the setting change automatically to Shared Network. I dont no why. So i check every morning the setting, becaue some software needs the right ip adresse in our network. I try to use the lock in the corner but nothing change. Why did Parallels automatically change the setting in the networkkonfiguration?
Try reinstalling Parallels Desktop and check the issue. You can download Parallels Desktop 13 by using this link