Downstream error

[Enterpr1se]

I am using QNAP TS-464 with 12GB memory.

I found it's very hard to download image or link preview when I use proxy.
I found there's downstream error in the log.
How can I fix it?

2023-05-17 03:54:51.116 [info] <0.1002.0>@mtp_handler:terminate:242 terminate normal
2023-05-17 03:54:51.654 [warning] <0.1009.0>@mtp_handler:handle_cast:150 210.1.1.206: protocol_error srv_error_filtered
2023-05-17 03:54:52.040 [info] <0.1010.0>@mtp_handler:init:106 mtp_handler_1: new connection 210.1.1.206:50435
2023-05-17 03:54:52.341 [info] <0.622.0>@mtp_down_conn:handle_rpc:291 Unknown packet from backend. Tag <<223,162,48,87>>, tail: <<83,63,1,234,75,138,182,233>>
2023-05-17 03:54:52.395 [warning] <0.1010.0>@mtp_handler:handle_cast:150 210.1.1.206: protocol_error srv_error_filtered
2023-05-17 03:54:52.652 [warning] <0.906.0>@mtp_down_conn:terminate:185 Downstream terminates with reason downstream_socket_closed; len(upstreams)=0
2023-05-17 03:54:52.652 [error] <0.906.0> gen_server <0.906.0> terminated with reason: downstream_socket_closed
2023-05-17 03:54:52.652 [error] <0.594.0>@mtp_dc_pool:handle_down:197 Downstream=<0.906.0> is down. reason=downstream_socket_closed
2023-05-17 03:54:52.652 [error] <0.906.0> CRASH REPORT Process <0.906.0> with 0 neighbours exited with reason: downstream_socket_closed in gen_server:handle_common_reply/8 line 751
2023-05-17 03:54:52.652 [error] <0.585.0> Supervisor mtp_down_conn_sup had child mtp_down_conn started with {mtp_down_conn,start_link,undefined} at <0.906.0> exit with reason downstream_socket_closed in context child_terminated