You don't say what your normal expected and contractual speeds are...
But going down to 40kbit/s is very likely due to some hardware issue. Call your provider, if you have not done so yet, depending on how many people are actually affected, they may not even notice this themselves.
By the way, water ingress would be just as bad, if not even worse, for a fiber connection than for a copper connection.
Regarding Starlinkā¦ I have to admit I have not read up on the technology behind it, except from what you get in the news, for example regarding the light pollution of the satellites. So take my musings with a grain of salt.
I would assume that each subscriber to Starlink gets an individual box. Everything else would not make sense in my opinion, giving the explicit goal of Starlink to provide internet to areas lacking infrastructure. I would expect for example, that an option including solar power will be available.
But I would not expect this to be cheap internet access in the "developed world" as well. The company still needs money, and I would be surprised if they are not using regional pricing for the connection. Also there will very likely be datacaps. And finally, even if you get comparable throughput, the latency will be worse in most cases, depending on the number and locations of the ground stations and their connectivity to the internet. And latency, depending on your workload, may be more important than raw speed.
Starlink will also likely suffer from similar effects of any other wireless media: Congestion. All users in the same cell have to share the bandwidth. No two clients on the same frequency can talk at the same time. Now imagine a Starlink cell (I do not know how large they will be, I heard something in the single digit square kilometer ballpark) covering a city, or even just a dense suburb...
Of course, depending how tightly controllable the individual satellites are, they could be maneuvered to provider better coverage in dense areas.
Starlink is an interesting project, to be sure. But if they can keep their promises has to be seen. In places where a wired infrastructure is in place though I doubt it will ever be able to provide equal quality. But that is true for any wireless media.
And the fact they are littering the sky with thousands of satellites might also be seen as quite critical.