Delays in starting a radio stream.

[MarmiteSandwich]

Hi all,
This has been an issue for some time now (months?), which seems to be getting worse, so I decided to do something about it. Couldn't find anything obvs wrong with streaming settings and it happens with 2 different renderers, so I have discounted the renderer. The context is MinimServer and MinimStreamer on 2 different Raspberry Pis, set up in identical ways. The renderers are upmpdcli/mpd on a pi (with OpenHome on - Fig2), and Cambridge Audio CXN v2, via BubbleUPnP server in Windows for OpenHome purposes (Fig1). When I choose a radio station from MinimServer and select play, as often as not, there is a delay for up to 1 minute, after which I get a response from Android BubbleUPnP like Fig1. If I leave it, it may spontaneously start to play within the next 5 minutes, sometimes it seems to stay in that state indefinitely. Before this behaviour became common, the stream would just play within a few seconds. If the play icon is showing, I can press on it, and get a response like in Fig2. The stream definitions for the stations illustrated can be inspected in _Radio.m3u.

Any ideas/suggestions welcome.
Marmite.

PS otherwise MinimServer and MinimStreamer have served me well since the BBC first changed to HLS streams.
Fig1    
Fig2    
minimserver-update-218
minimstreamer-2.0.9
BubbleUPnP Server 0.9-update43