Line & Clustered Column Chart - Issue obtaining a Continous Line if X-Axis is Date

[HotChilli]

You will have to remove those 0 values (either from the data or from the visual) to get the chart you want.

You can experiment with a slicer that holds all the MTBF values.  Select everything that is not zero and I reckon you will get the right chart.

So, if you prove that, you can either remove all the zero rows in power query or use a slicer, somethinglike that.