We highly recommended printing of these cable strain relief for the tool head and bed slinger via below designer/makers.
Toolhead:
https://www.printables.com/model/281061-ender-3-s1-cable-holder
Bed:
https://www.printables.com/model/377654-ender-3-s1-pro-bed-cable-strain-relief
If the wiring already has fault and intermittent issues, you may need replace the wiring loom, in most case its rarely the toolhead PCB unless you have damaged connectors, its usually a good idea to check near the toolhead cable for broken/wear on the wiring.
Ender 3 S1 / Pro: https://store.dremc.com.au/products/ender-3-s1-main-cable-loom-only
Ender 3 S1 Plus: https://store.dremc.com.au/products/ender-3-s1-plus-main-cable-loom-only
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