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There are many other possible reasons why your speeds etc. are not satisfactory. Inadequate infrastructure is the least likely. From what you say it appears that the low speeds at certain times are on WiFi, and that suggests local interference. You say 'on 2.4'; what is the speed like on Ethernet?
Hi @Clae, we're keen to look into your connection and make sure you're getting the most out of your service.
If possible, check the speed via ethernet as @alanguide suggested. This would help us narrow down whether it's a WiFi issue or not.
You can also have a read of these articles.
Troubleshooting a Slow Internet Connection
Easy Steps to Improve Wi-Fi Connection In Your Home
Let us know how that goes.