In my experience SERVIIO is NOT IMPROVING !

I first meet with Serviio at version 0.60 ,
And in my experience that was the MOST RELIABLE version ever...
From version 0.60 til v1.2.1 I've tried all versions but in all of them (except 0.60) I faced with same problems
In the beginning, I've just installed 0.60 and started to use in all my network with all my devices in a very reliable way.
But after this version I've always experienced insatiability problems like "sometimes Serviio server could be seen from other devices and sometimes invisible", "sometimes serving sometimes not"
I checked my PC and everything seems well, server seems running without any problem . (in Windows 7 x64)
I tried to install the software in other connected PC's and laptops, but I see insatiability problem continued on them as well (as sometimes running good, sometimes server is invisible/not running )
I've 1 NAS and 1 other router which has nas function on it in my network. They are always running stable in my network.
(I was using Plugin Youtube.groovy . Additionaly after version 0.60 it becomes unfunctional as well. Although URL is right and has many video feedbacks inside, when I explore the folder by serviio folders shows "No Video" message ???)
(By the way, in version 1.2 it was at least running sometimes. BUT after I installed version 1.2.1 I NEVER see the server from other devices. But from PC end, everything seems running well as always seen)
I tried to uninstall and turn back to version 0.60 and I see again everything runs stable and well. (I thought about to turn back to old version but it is annoying that every time it asks me to update to a new version)
Is there any idea, what can be wrong with the new versions in my situation?
And in my experience that was the MOST RELIABLE version ever...
From version 0.60 til v1.2.1 I've tried all versions but in all of them (except 0.60) I faced with same problems
In the beginning, I've just installed 0.60 and started to use in all my network with all my devices in a very reliable way.
But after this version I've always experienced insatiability problems like "sometimes Serviio server could be seen from other devices and sometimes invisible", "sometimes serving sometimes not"
I checked my PC and everything seems well, server seems running without any problem . (in Windows 7 x64)
I tried to install the software in other connected PC's and laptops, but I see insatiability problem continued on them as well (as sometimes running good, sometimes server is invisible/not running )
I've 1 NAS and 1 other router which has nas function on it in my network. They are always running stable in my network.
(I was using Plugin Youtube.groovy . Additionaly after version 0.60 it becomes unfunctional as well. Although URL is right and has many video feedbacks inside, when I explore the folder by serviio folders shows "No Video" message ???)
(By the way, in version 1.2 it was at least running sometimes. BUT after I installed version 1.2.1 I NEVER see the server from other devices. But from PC end, everything seems running well as always seen)
I tried to uninstall and turn back to version 0.60 and I see again everything runs stable and well. (I thought about to turn back to old version but it is annoying that every time it asks me to update to a new version)
Is there any idea, what can be wrong with the new versions in my situation?