Manjaro tends to use one of the core of my dual core CPU to 100% after some time of using the system

[Aragorn]

Please take the time to read the following post…

[HowTo] Provide System Information

This tutorial is superseded by this one. Remember all Tutorials are wiki posts that can be edited by TL2 (Trust Level 2) members and above. Welcome to Manjaro! To allow all of us helpful people on this forum TO HELP YOU, we need some basic information about your system. This probably means you described the symptoms of your problem, but now we need some more information to know where the origin of your issue is exactly. Someone else probably linked you to…

Without the proper information, nobody is going to be able to help you. For instance…

• Is this a desktop computer or a laptop/notebook?
• Are you running the 32-bit community version of Manjaro, or the official 64-bit Manjaro?
• How much RAM does that machine have?
• Have you checked what is hogging the CPU core with htop or top, or perhaps a graphical system load monitor? (I don’t run XFCE, so I don’t know what it is called there, but in KDE Plasma it’s called System Monitor.)