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You have left out some information, the main ones are the version of TrueNAS you are using and the drives and layout. You may need to include the NIC type as well, I don’t personally know if the HP system comes with a Realtek or Intel NIC but if this is a RealTek NIC, that would be the first thing I would say is the problem. But there is a lack of information so it is just a guess.
I would also add in how long the system has been running, and under what kind of usage. Have any stability tests been conducted? There are a lot of things we could ask. Are the cooling fans all running properly? It can go on and on. So please read and add in the extra information. And do not forget to include some data on the Windows machine as well.
And again, Welcome to the Forums
Please read Joes Rules to Asking for Help.