How to stop spices burning when browning meat?
You've got a few options:


slightly cooler can make a big difference (basically buying you time to keep things moving). 
or hotter can brown the meat faster if it's going to be cooked through in a sauce. 
(more) oil should stop the spices sticking to the pan; that's when they burn
if they're big chunks of meat you can turn them individually rather than stirring. Less will fall off. 
when you can't stop the spices burning the meat is probably browned enough, even if you'd like a little more colour. Have your liquid ready to add
if you're browning before a long cook in liquid, do you really need to season the meat before it goes in the pan, or can you add the spices when the meat is nearly browned?


Many spices want to be browned to release or improve the flavour, so it's probably a small adjustment that you need to make.