ysfsuleman

He is using BMS comms so those values mean nothing .

You should charge it to 100%, otherwise the SoC will drift and cells could go out of balance, causing issues like the one you are experiencing.

On the battery setup page untick "BMS_Err_Stop".

Put some tape on the battery communication ports. You don't want random stuff and gunk to fill it up.

Geez this thread is awesome and provides real world fixes and recommendations! Much appreciated #newbie

Yes, considering that if you combine the Sunsynk battery with a Sunsynk inverter, that extends the warranty to 10 years.
Also, the Sunsynk offers a 1C discharge rate, so if you're buying only one battery, compared to the Shoto and the Dyness, the Sunsynk's offering has a distinct advantage in this regard.

I'd still suggest getting a comparative quote including installation, bearing in mind that the Shoto is rack-mounted while the Dyness could be wall-mounted. You may incur additional costs for a cabinet or fitment brackets, etc.
Beyond that I think you're in territory where the price alone shouldn't be the deciding factor, but it could help to dig deeper into understanding the warranty conditions, the warranty period, remaining usable life at the end of the warranty period, allowable cycle life, and any other exclusions to see which one offers the better deal.
For example, if you follow the warranty details in the links you posted, Shoto offers a 5-year warranty from date of manufacture, while Dyness offers a 7-year warranty from date of invoice, and up to 10 years upon registration. In that way the Dyness could be a better deal after 8 years if something goes wrong with the battery.
On the other hand, Shoto seems better in allowing up to 700 discharge cycles in a year, while the Dyness warranty covers basically one full cycle per day. It could be that Shoto ends up being a better deal after 4 years if there's been heavy loadshedding that requires sometimes more discharges per day, say if you're on 500 discharges per year and the battery conks in, while on a Dyness you may not be covered.

The only major difference between those batteries is the charge/discharge rate. The Shoto does 100A, but the Dyness only does 75A which will come in to play if you are planning to only install 1 battery. That inverter will require 100A to deliver 5kVA, so you would need 2 of the Dyness to get full power delivery.
They both support CAN comms so there shouldn't be a problem with the sunsynk.

Shoto is still recommended to be run at 50A discharge. Both are still not a true 1C.