I had a similar issue with mine after a month of use… it turned out because of security restrictions my host was employing that my log in was always changing so it kept me out until they gave me another link to use for admin and all was fine.
Are you using wifi with a random IP generation with it or a cellular connection?
Although I got that fixed I still can not FTP in because of my connection but when I go elsewhere I can. It could be on your end or the host security.
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