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RT-AC86U wifi issues - email send & receive only - with stock firmware?

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I'm running an RT-AC86U with the latest stock firmware (

I have this weird issue where email send and receive (using SSL/TLS on ports 465 and 993) will just stop working on all wifi connected devices (Smartphones, laptops, desktop PCs) every couple of days or so. Browsing the internet, transferring files etc continues to work. Sometimes the 5Ghz band only is affected, sometimes both the 5Ghz and 2.4Ghz bands.
Once I reboot the router, it works again for a couple of days.

Has anyone else had a similar issue and any idea how to troubleshoot and solve it?

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