ERR_SSL_PROTOCOL_ERROR with haproxy

Help!
1

Having rare ERR_SSL_PROTOCOL_ERROR error in browser while using own proxy with haproxy routing all on the server in one port. Can get error on randome websites 1+ time a day, and reloading page fix it. Before using haproxy there was no errors like this. My haproxy.cfg looks like this:

global
   log /dev/log	local0
   log /dev/log	local1 notice
   chroot /var/lib/haproxy
   stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
   stats timeout 30s
   user haproxy
   group haproxy
   daemon

   # Default SSL material locations
   ca-base /etc/ssl/certs
   crt-base /etc/ssl/private

   # See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
       ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
       ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
       ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

defaults
   log	global
   mode	http
   option	httplog
   option	dontlognull
       timeout connect 5000
       timeout client  50000
       timeout server  50000
   errorfile 400 /etc/haproxy/errors/400.http
   errorfile 403 /etc/haproxy/errors/403.http
   errorfile 408 /etc/haproxy/errors/408.http
   errorfile 500 /etc/haproxy/errors/500.http
   errorfile 502 /etc/haproxy/errors/502.http
   errorfile 503 /etc/haproxy/errors/503.http
   errorfile 504 /etc/haproxy/errors/504.http

listen front
   mode tcp
   bind *:443

   tcp-request inspect-delay 5s
   tcp-request content accept if { req_ssl_hello_type 1 }

   use_backend dns if { req.ssl_sni -m end dns.domain }
   use_backend panel if { req.ssl_sni -m end panel.domain }
   use_backend reality if { req.ssl_sni -m end discordapp.com }
   default_backend fallback

backend dns
   mode tcp
   server adguard 127.0.0.1:1444

backend panel
   mode tcp
   server srv1 127.0.0.1:10000

backend fallback
   mode tcp
   server srv1 127.0.0.1:11000

backend reality
   mode tcp
   server srv1 127.0.0.1:12000 send-proxy
2

Update: from logs I found this

SD 20/20/19/19/0 0/0 - SD indicates about connection error.