I have had a similar issue (unstable performance, web interface unresponsive) when attempting to upgrade to 8.1.0 with my Balance 20 HWR 1. Have tired twice since the release of 8.1.0 but always have to revert back to the previous firmware (8.0.1 build 3658 in my case) due to it being unstable. I have two users in my home with about 20 IoT and IT devices on a single 75/25mb connection. I would venture to suggest there is more to the issue than the 60 users discussed above.
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Same problem with balance 20 upgrading from 8.0.2 to 8.1.0:
web interface unresponsive, dhcp unresponsive and pepvn broken with pepvn enabled, ok when pepvn are disabled.
return to 8.0.2 and all is well
Havenāt seen this referenced yet but the upgrade of my balance 20 to 8.1.0 last week resulted in a constant āconnectingā death spiral on WAN 1 interface, never actually connects. I swapped the feeds to confirm it was not the router or cabling. WAN 2 connected with no issues regardless of the source. A reboot to 8.0.2 āfixedā the problem. Guess Iāll wait for the next update.
I have been experiencing similar issues with a couple of Balance 20 routers (HWR 6) since upgrading to 8.1.x. The one I use at home frequently shows 100% CPU utilization and admin interface becomes unavailable whenever I try to log in to the management interface through IC2. It also seems to happen randomly for no apparent reason. Only doing basic routing, DHCP, and DNS with ~10 devices. Hoping the Peplink team can figure out where they went wrong with this one.
Omar
For those having issue after upgrade using firmware 8.1.0 , possible please open a ticket to allow Support team to further check on the issue.
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We have reviewed few reported cases and found that there is a potential bug that affects the system stability. I suggest upgrading to the firmware below which fixed the bug.
https://download.peplink.com/firmware/plb30/fw-b20_30-8.1.0s083-build4956.bin
For those still having stability issue with this firmware, please help to open ticket for us to investigate. We may need to check the device usage and other factors.
Thank you.
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Upgraded my B20 at home and will keep an eye on it. Thanks.
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Iāve been keeping an eye on my BPL 20 for the past few days and it seems to be way better now. Havenāt had any lock-ups or crashes since upgrading to build 4956.
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@OmarVR, this is a great news for us. Thanks for your feedback! 
@TK_Liew
Same issue seems to be present in 8.1.1b01 build 4963.
Replied here : Firmware 8.1.1 Beta 1 - #19 by sitloongs
This build has worked for me as well
This issue with Balance 20s is still present on 8.1.1 Beta 2. So far seems even worse.
Do you have ticket opened ? We may need to investigate further from your device seen the fix is not helping you.
No, I havenāt opened a ticket. But the changes introduced in 8.1.0s083-build4956 did indeed fixed the issue. After upgrading to 8.1.1 b2 the issue reappeared.
Whenever I try to do a āRemote Web Adminā from IC2, my Balance 20 CPU utilization goes to 100% and stays like that for a while. Web admin interface never shows up and end up getting the āUnable to connect to deviceā error. Also unable to access the web console locally. Just reproduced this again 15 minutes ago.
Went back to 8.1.0s083 and everything seem to be fine again.
@OmarVR, we have a few cases that are running fine with 8.1.1b02. We would like to take a look to your device. Please help to open ticket. Please attention the ticket to me.
Thanks.
Ticket opened. #20110740