Control point cant see minimserver

[steve.pratt46]

Hi.
I'm having trouble with my control point seeing minimserver.
All had been working fine until i updated to minimserver 0.8.4 update 94.
I also installed JAVA SE embedded 8 on my NAS.
I have Synology NAS DS112+ . I use BubbleUPnp on my android as my control point
I have a BT homehub4 router. Ive tried disabling the 5GHZ network but this do not help.
What happens is occasionally i can see the minimserver on my control point but when i logout and try and re-connect its not seeing Minimserver.
I also have a pioneer streamer which also now is sometimes visible and sometimes not.
My NAS is connected to the LAN via a switch and a DP link homeplug. The router is also LAN connected to same DP link
My streamer is connected to the same switch as the NAS along with TV, play station, freesat box.
My MinimWatch is connecting fine to the minimserver.
I did add 2 more TP link homeplugs about a week ago but all was working fine after that, its just been since the resent software upgrades that Ive been having trouble.
Ive attached latest MinimWatch log.
I suspect its a network issue but not sure what to do.

Thanks