Weird Network Issue

We are running a ASA 5512 and a Cisco 881.  There is a tunnel setup between the two devices.   Last couple of days the tunnel has been acting reallly funny.  I never drop a ping accross but my connection to devices drop like RDP.  I know my other tech tried to create inspection on the two firewalls but he said he removed everything.  I am lost to what to look at.
Robert EnerPresidentAsked:
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Justin StearCommented:
This almost sounds like a timeout issue.  Do you have any timeout settings applied?

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Maybe you have problem with MTU?
ping is only 32 bytes
If you ping from Microsoft OS you can do
ping -l 1450 x.x.x.x -t
and does big packets are passing.

To decide max MTU size to pass without defrag you can do Cisco extended ping first
# ping
Protocol [ip]:
Target IP address: x.x.x.x
Repeat count [5]:1
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface:
Type of service [0]:
Set DF bit in IP header? [no]: y
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]: y
Sweep min size [36]: 1400
Sweep max size [18024]: 1500
Sweep interval [1]:
Type escape sequence to abort.
Sending 101, [1400..1500]-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
Packet sent with the DF bit set

All you need to do is count ! starting with zero and than should be your MTU for tunnel packets.
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