Issue with Copernicus DEM for topo phase removal

Hi there,

I’m having an issue with topo phase removal using Copernicus DEM. As you can see the topo phase shows some gaps in the DEM which creates stitches on the interferogram.
I tried to use different tile extensions, no difference.
Then I I tried to use GETASSE DEM instead and it seems to work fine.
The images here illustrate my problem.
Thank you!