Hi,
I've been using Aquacomputer gear for a really long time and generally love it, but I'm running into some frustrating issues recently, so I'd love some assistance!
I'm currently running an Octo, Highflow Next and Farbwerk360. I have a setup with a physical ambient air sensor plugged into the Octo, the Highflow Next measures Water Temp., and I use Playground to calculate a DeltaT that I plug back into the Octo as a 'Software Sensor' which then drives some basic temperature target fan controllers.
Recently, I've been having issues where either:
- My fans suddenly blast to 100%
- They stay at a low speed, water temps exceed 45C and then the Highflow alarm triggers.
In the first instance, sometimes Aquasuite becomes unresponsive, and the only way to recover the situation is to restart the machine, or to disconnect and reconnect the Octo. Other times, the Playground has recognised that the Highflow data is no longer reliable, and falls back to 40C water temp, which generally pushes my fans to 100%.
In the second instance, Aquasuite is running seemingly fine, but all sensors are 'stuck'. So whatever my Delta has been calculated as at a point in time becomes fixed in place. The devices themselves continue to work (the Highflow display still cycles with updated data), and I can still control other aspects of the devices (such as RGBpx), however all sensor data is now stuck in place. I've also seen instances where the sensor data is 'stuck' for one or two of the devices, but eventually it spreads to all three (I am monitoring this both through Aquasuite and HWInfo. Another fun fact, if HWInfo isn't already running when these issues occur, it fails to launch properly). The only resolution here seems to be to disconnect and reconnect all the devices.
I've tried using different USB headers, different hubs, more/less fans/channels and also playing with the "Automatically reset USB connection in case of errors" setting in Aquasuite. When this setting is enabled, I can see the following error in the logs when the issue starts to arise:
{"Group":1,"UTC":"2025-12-04T13:25:12.8639044Z","Message":"Reset USB, Winusb locked, octo: 29738-28672","Source":"USB ERROR"}
This error doesn't always appear when the sensors freeze up, but it appears fairly regularly in the logs.
This is also the first instance of this occurring (4th December 2025), and the only Windows Update I can see around this time is for a Windows Defender Definition (KB2267602 (Version 1.441.702.0) & KB2267602 (Version 1.441.713.0).
Only other thing worth noting, this only really seems to happen when I'm playing a game (at the moment that's usually Escape from Tarkov). I haven't really noticed this on the desktop; although that said I wouldn't notice the second failure mode on the desktop as fan speeds shouldn't be ramping up in that scenario anyway.
Apologies for the brain dump, just trying to make sure I convey as much as possible. Any help will be greatly appreciated. 
20.01.2026, 19:36
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