Connection attempt failed with "ENETUNREACH - Network unreachable"

[KenMarinaris]

Hi and welcome
I tried to ftp from my Pc to Raspberry Pi OSMC and later to my Google Pixel too. The same problem persists.
I am able to connect to these devices and start transfering files. However after 5-15 seconds the process is stopped by Filezilla with the following message:

Error: Transfer connection interrupted: ECONNABORTED - Connection aborted
Error: Disconnected from server: ECONNABORTED - Connection aborted
Error: File transfer failed after transferring 6,553,600 bytes in 9 seconds


Status: Connecting to 192.168.0.15:2221...
Status: Connection attempt failed with "ENETUNREACH - Network unreachable".
Error: File transfer failed
Status: Connecting to 192.168.0.15:2221...
Status: Connection attempt failed with "ENETUNREACH - Network unreachable".
Error: Failed to retrieve directory listing
Status: Disconnected from server

I do not have ANY antiviruses intalled on my PC, no firewall active. I have changed my router form Virgin Media 2 to my old Linksys WRT54GL and still the same. I cannot tranfer any large files. I can transfer small pictures but not bigger video files. Any ideas guys? Maybe one of the windows 7 services has been stopped but I do not know which one though? Maybe my cheap WiFi Card is to be blamed [Ralink RT2870]. I would be grateful for any ideas, thanks in advance.

[botg]

Looks like the wireless connection is going down. Try a different wireless adapter, or preferably a wired connection for high reliably.

[KenMarinaris]

Thanks for your reply. It must be what you are saying. I tried my wife's laptop and was able to transfer any big video file. I think I will buy somethimg more reliable, TP link maybe.
Ralink RT2870 wifi dongle is cheap and quite good unless you want to ftp some bigger files.
Thanks again