@Benjamin89 - I use a Kanger Subvod in rotation with other mods every day. Haven't ever had the 10 second cutoff come on with it. My draws are usually between about 3-5 seconds though.
How long have you been using
the same ones? Over a period of time, with regular use and recharging, internal batteries
will gradually start being less efficient, sometimes doing "wonky" things that they didn't when newer, etc. in my experience with them.