Gateways, upload speeds

Sorry for the spam.

I tried uplink with 8 parallelism, which have better perf (470 Mbits/s upload, with 8 parallelism)
But when I try with 16 parallelism, I have this error

Error: uplink: stream: ecclient: successful puts (0) less than or equal to repair threshold (35); context canceled; context canceled; context canceled; context canceled; context canceled; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user; uplink: stream: context canceled; ecclient: upload cancelled by user

I’ve noticed few links that talk about this and the fact that there are not enough nodes available