- Swap equipped legendary weapon whose upgrades are present in more than one loadout for another one from your inventory -> ejects all upgrades.
- Take one of the ejected upgrades and put them in your bank -> templates can no longer access the upgrade.
- Now switch to another loadout that requires said upgrade -> enjoy your disconnect.
- Load character and try switching to said loadout again -> rinse, repeat = fun! (not)
It would be good to look into this bug and fix it. (The equipment template system needs an overhaul anyway. It's currently in an open beta state.)