Serviio

Hello.
From yesterday serviio latest 1.5.2 and 1.6 stopped working with java 1.8 on DS413 with error:
Java HotSpot™ Embedded Client VM warning: G1 GC is disabled in this release.
any idea?

That's a warning not an error. It happens every time you start Serviio using Java for Embedded. It's not important as one of the other GC methods will be used.
If your Serviio is broken there may be some other reason, but this isn't it.