Weird issue with AiMesh on CDN-used sites

[aprudovsky]

Config:
Main AX-88
AX-58 as AiMesh node thru 5GHz
both on Merlin 384.19

issue:
after some uptime of whole aimesh net, devices connected thru the mesh node (not a main router), when try to open CDN-used sites starts to get a timeouts for a CDN resources (pictures, etc.)
when the same device is reconnected (just at the same time) to a main router - there's no issues - timeouts, etc. And when the device initially is connected to the main router - there's no issues at all.
Behavior not depends of device (PC, tablet, mobile), browsers (Edge Safari FF) - just the same picture
When I start an VPN session on device which is connected thru the node - there's no described issues
I've tried to on/off DNS filtering, diversion, etc. - no changes
system log doesn't show any error messages when this issue occur

After a reboot of whole aimesh network - there's some "started" (from minutes to hours) period of time, when the devices connected thru node doesn't get the issues.

Example of errors from Edge debug (tried to open tinkoff.ru but the similar is for kia.ru):

mm.js:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
mm.css:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
NeueHaasUnicaW1G-Regular.woff2:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
font-v8-pfp.css:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
12b95961-1b70-4a08-9bb3-fbecd62863ab.webp:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
header.css:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
TinkoffSans.woff2:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT


GET https://www.cdn-tinkoff.ru/cdn-healthz.txt net::ERR_CONNECTION_TIMED_OUT

platform.45c6c452dc8db2dc1ddd.chunk.js:1 GET https://www.cdn-tinkoff.ru/platform/lib/sentry/5.17.0/bundle.min.js net::ERR_CONNECTION_TIMED_OUT



e6e00c5a-082d-49a5-aa9b-750fc0882f1c.svg:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
3bebc25d-073c-4d16-9ca8-65a7d54884a3.svg:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
2(индекс):233 GET https://acdn.tinkoff.ru/static/pages/files/24903d7c-1e2b-4c66-9fdf-dcbb8a15fd7d.webp net::ERR_CONNECTION_TIMED_OUT
content.js:1 www.tinkoff.ru <<<<<
acdn.tinkoff.ru/params/common_front/resourses/icons/favicon-32x32.png:1 GET https://acdn.tinkoff.ru/params/common_front/resourses/icons/favicon-32x32.png net::ERR_CONNECTION_TIMED_OUT
(индекс):233 GET https://acdn.tinkoff.ru/static/pages/files/b1e22f40-b60f-4ab6-ae93-44b1bf52b437.webp net::ERR_CONNECTION_TIMED_OUT
GET https://acdn.tinkoff.ru/params/common_front/resourses/icons/icon-144x144.png net::ERR_CONNECTION_TIMED_OUT
(индекс):1 Error while trying to use the following icon from the Manifest: https://acdn.tinkoff.ru/params/common_front/resourses/icons/icon-144x144.png (Download error or resource isn't a valid image)
4(индекс):233 GET https://acdn.tinkoff.ru/static/pages/files/d215d3c4-3b10-4a14-b277-73f17db83b6c.webp net::ERR_CONNECTION_TIMED_OUT

Is any ideas - what is the cause of this issue? Or the remedy for this...