powershell doesn't like fast typing?

[dave...@gmail.com]

If I try and change the drive in powershell by typing D: <enter>
it will change to the D: drive.

However if I type the the three keys very quickly it will come up with a
>> prompt and I have to press enter again.

Any idea what's wrong? I do like to type fast and this problem is an
annoyance.

Here's some example output:
PS D:\> d:
>>
PS D:\> e:
>>
PS E:\> f:
PS F:\>
PS F:\> f:
PS F:\> f:
>>
PS F:\>

those with the >> I've typed "too fast".

Name Value
---- -----
PSVersion 5.1.17134.765
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.17134.765
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1