The nice thing with this is it is one of three things because you have a single wire driver for each the high and low beam then a shared ground. Since you said the highbeam was working when the low did not work, we can assume the ground is good. However, it wouldn't hurt just making sure it is tight.
From there it can only be the bulb is failing but it is unlikely that it will fail then start working again. So that leaves a wiring/connection issue or the integrated power module. If it were me, I would just get a new bulb because they are pretty cheap and then when the connector is off you will want to check and make sure there is no water intrusion or any green growth on the terminals. If you are not sure what you are looking for then before you replace the bulb just gently wiggle the connector on the bulb and see if the headlight turns on and off. If it does then you have a connection issue.
If all else fails, then I suspect you have an issue with the integrated power module but I would think this is a connection issue. Let me know if you have questions. Thanks
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Friday, February 14th, 2020 AT 6:15 PM