Try the same act again, but with other USB or connected devices unplugged if possible, to make sure that nothing else is causing a minor conflict. Make sure the drivers for all your usual connected devices are up to date. If holding down keys is still available for other actions other than reviving team-mates, test in offline mode if there is one, and change your graphics or display settings in the game to a lower level to rule out the problem being related to hardware, the internet or game servers. Make sure the game is also up to date. If no other software has a similar problem, then consider posting your question on an official forum for the game, or contacting the developer.
What is Markdown?
Markdown lets you add more formatting to your post. Simply type in your post and it will display as written.
If you wish to add bold or italic characters, add a hyperlink to another website, a heading or a horizontal line, simply use the relevent icons above the text input field.
A preview of your post will appear in the grey box below. If you make a change and you're not happy, simply press the back arrow icon to undo.