This sounds a bit like an issue that has come up on this forum concerning rpi4's USB3 and wifi 2.4GHz radio. If you search this forum on this topic you can see that a number of folks have extensively researched this problem to narrow this issue down (I apologize as I cannot remember the forum member's name). Anyhow, the chipsets are too close together and interfere with each other when they are both operating creating some non-deterministic behavior in astroberry. For me I had very similar symptoms to what you describe.

The quick and effective solution that has been working for me and some others is to force the rpi4 to use your router's 5GHz network (and also only create a 5GHz hotspot when away from home network). That way you can continue to use the USB3 at full speed for your main imaging camera (assuming that's what's plugged into that port) and you will have remote connectivity over wifi.

Lastly, I would recommend using VNCViewer over the browser (more efficient and better latency) or better yet, use kstars on your latop/desktop and remotely control your indi-connected gear (client/server mode).

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