Hi there Astraës,
It would definitely seem related since most of the errors you posted specifically mention nameplates or TellMeWhen.
If you don’t have the latest versions you can try simply updating your addons or if they need some additional configuration you can try the UI and Macro forums.
Other than that we can’t really help directly with third party addons directly and if you continue to have problems you may want to disable them for now or try with some alternatives.
Should you still run into game crashes without any addons running, you can also find more info and steps to try here: World of Warcraft Lockups and Crash Errors.
Best of luck and I hope you can get something working for what you need!