Your comments
Yes, this seems to be a bug in iOS 9 and a reboot usually fixes it. :(
You can add custom syntax definitions to Textastic by using TextMate bundles. See http://www.textasticapp.com/v5/manual/lessons/How_can_I_add_my_own_syntax_definitions__themes_and_templates.html
A quick search for "Gherkin tmbundle" in Google brought up this TextMate bundle which may work:
Do you have screenshots or a step-by-step list so I can try to reproduce the problem on my device?
Thanks for letting me know.
Does it work again? Sometimes the iCloud servers do have a hiccup and it starts to work again after some time.
Are you sure this is related to Textastic?
Have you added any folder to the sidebar maybe? I've seen CPU spikes when adding certain folders that change often to the sidebar.
I've submitted Textastic 5.3.1 to the App Store which fixes this problem.
Customer support service by UserEcho
Yes, you can delete a post using "Delete" in the Actions bar on the right side.
I'll delete the topic!