Sounds more like your personal problem.
I live in Germany and use both. None do that and as I'm "the IT guy" for many people at work an din private, I'd have heard about it. Hell, the whole continent would have heard about it as whatsapp is widely used.
My Signal also doesn't do that.
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I'm confused about how it is that because it hasn't happened to you or anyone you know, it's my personal problem that closed-source software that I have no capability to modify is working slowly or failing to work at all?
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