My digital miner doesn't work in silk touch mode when it has any speed upgrades applied. It worked fine at first but once I picked it up and moved it, it wouldn't work anymore it just sits idle and says it's working but doesn't mine anything. I made a second digital miner and it worked fine with silk touch and speed upgrades but after closing the game and re-opening it wasn't working again. It starts working again when I remove the speed upgrades.

MC and Mekanism version?

Ah. You need some energy upgrades :)