I've got a tricky problem and I don't know who is responsible for this, my company? me? but first let me explain.
I have a Managed Wordpress plan with a big company and I m facing a strange issue. I'm connecting to SFTP normally, I'm uploading some files succesfully but after that I get error messages like this one "Error: Network error: Software caused connection abort". I can download files, I can view all the files but I cannot upload. The strange is that sometimes I'm restarting my PC and sometimes everything works fine, sometimes now also If I'll try to upload from other PC works fine too (until this happen to the other PC too), I even uploaded a file from my phone because I couldn't do it from my computer. Sometimes this issue goes away after several hours and I can normally upload again for some hours.

P.S. I can't change anything at the Wordpress Admin panel too. All my changes loading forever until the msg that the server isn't responding.

Sorry for my broken English, not my first language,
If you need any more information please let me know.

Thank you in advance,