Pokemon-go – How many Pokemon can I catch daily in Pokemon Go

Pokemon give no visual indication of being about to run away.

However, Pokemon such as Abra are (still) almost guaranteed to run following a failed capture attempt. The chance any given Pokemon will run away on the first throw (without any sort of modifier) is given in the BaseFleeRate variable from the decoded ProtoBuf file.

Additionally, Pokemon with orange or red rings have a higher initial chance of running away. All Pokemon will run after enough turns have progressed, as the chance of a run increases each unsuccessful turn.

You are probably soft banned.

Soft banning occurs when the game detects that you're moving around too quickly. This can happen if:

• You use GPS spoofing to fake your current location.
• You travel in a vehicle at an excessive speed.
• You disable your GPS, travel a significant distance, then re-enable it.
• You lose data service, travel a significant distance, then re-connect.

The following are symptoms of a soft ban:

• When you throw a Pokeball at a Pokemon, it wiggles around a bit, then flees without fail.
• When you try and spin a Pokestop, it never turns purple, and you never get any items.
• You are unable to challenge or train at any gyms.

If you are soft banned, the ban will lift itself within a few hours.

Here's a video of what a soft ban looks like:

Currently, there is speculation that the soft ban mechanism functions similarly to the "bubble effect" in Ingress, the last ARG developed by Niantic. This effect is explained here:

No matter what speed you are traveling, you can perform an action as long as you haven't performed one in the last 15 minutes. Once you perform an action, a figurative "bubble" is created. This bubble expands at the rate of 60 km/h. If you travel out of this bubble, you will not be able to successfully perform actions. So, once you slow down, you have to wait for the bubble to catch up with you before you can perform actions again. After 15 minutes, the bubble goes away, and you can perform actions again even if the bubble hadn't caught up to you yet.

(For US readers, 60 km/h is approximately 37 mph.)