Clients connect to wifi with certificate that expires every month - correct way to handle expired certificates?

Hi all
I'm sorry if this is the wrong forum to ask this question. Also my knowledge in this area is somewhat limited, which I why I need your help :-)
We use wireless networks primarily in my company for all our clients and use a certificate to authenticate to the network. This certificate expires after 1 month and we automatically renew them 1 week before expiry. Relatively often we have users that
are not connected to the network for a few weeks or more and then the certificate expires before being renewed. Then we have to connect them to the wired network to get the certificate updated, so they can connect to the wireless network again.
What is the correct approach to solve this issue? We feel extending the life of the certificate would be a too big security compromise. Is there some way you could automatically allow an expired certificate briefly with the sole purpose of renewing the certificate?
Or how would you normally resolve this issue?
Thanks for any help/knowledge you can provide :-)

> Setting the validity period that high, means that the certificate could be cracked before expiry.
then you should be scary of CAs which validity is 10 or more years. And they use the same cryptography as end-entity certificates (key length and signature algorithms). It is a paranoya. Just make sure if client certificates use at least 2048 bit long
keys and use SHA1 (or better) signature algorithm. In this case there is a little chance that certificate will be successfully cracked in 2 years.
If there is an evidence (or indications) of client private key compromise -- immediately revoke the certificate and publish new CRL ASAP. You cannot protect clients from key compromise by using short-living certificates, because key compromise is ususally
achieved by gaining a control over the private key (malware on client computer). Therefore, there is nothing wrong in issuing client certificates with 1 or 2 year validity.
My weblog: en-us.sysadmins.lv
PowerShell PKI Module: pspki.codeplex.com
PowerShell Cmdlet Help Editor pscmdlethelpeditor.codeplex.com
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