Issue with Devialet Remote for iOS

[maxijazz]

As @thumb5 said. Disabling, then enabling wifi should help. You can uninstall then install Remote App, but i don't think that is a root cause.
Problem with wifi in ios is that Apple implemented "anti-tracking" mechanism in IOS11 (if i am not mistaken), that periodically changes MAC of wifi interface. It confuses all other devices on LAN, that use ARP cache for mapping MAC and IP address.