I've botted through the night recently, without any problems. (I login on a different server than the auto-relog. So I would know if it disconnects)
But I prefer using Grimoire 3.6. I'm having less lag, and shorter loading times with it.
3.8 is good for when you want to mess with packets. But since it's a proxy, it adds an extra delay. Perhaps this is enough to disconnect you when the servers are in need of maintenance.
If you don't want to "downgrade", then try some other server.
I really doubt AE is adding measures against bots.
They could have done that a long time ago already. As a matter of fact, they did. And reverted cause they where losing too many players.
The only actions they seem to take, is when it involves money. (trading accounts, shoploading certain stuff, glitches with acs ...)
Biney also released the source code of Grimoire 3.8 (check the sticky). So if anyone is interested, they can add their own features to it.