Hi, thank you for the report.
You will need to change your light settings to get better results. You can set the resolution of you shadow texture to "Custom" (Shadows -> Realtime Shadows -> Resolution), and select a higher value for your spot light, at the cost of performance. Try f.ex. 2048 instead.
In addition, you can set the bias to "Custom" as well (Shadows -> Realtime Shadows -> Bias), and fiddle around with the Depth & Normal bias. I suggest try setting the Normal bias to 0.
Hope this resolves your issue.