If it's the older style Time Capsule, sounds off. I have one. It makes no noise to speak of. I think you might have a drive going south.
I will say that the AC68U suggestion is a decent one. I moved to that router from using the TC as my router and it's extremely easy to configure and capable. The TC is now just a client on the network; I disabled all the access point functions.
I also have an external drive hooked to the AC68U to cover my laptop (the 3 TB Capsule only barely accommodates my 3 TB iMac :/) and Time Machine works just as well through that as the TC, and it's probably faster. The TC is truly butt-slow.
Yep, it's the 4th Generation
The link given for the AC68U is for the U.S. I'm in the U.K. so I need to check if that model is available here.
I have another thread in Mac Mini section so if you take a read of that you'll see that my goal is to do away with the Time Capsule altogether.
EDIT: Is the AC68U a modem and router or router only?
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