Thank you for reaching the Small Business Support Community.
I would first suggest you to make sure "Perfect Forward Secrecy" setting is disable on the ASA and "PSF Key group" uncheck under the "Advanced VPN settings>Auto Policy Parameters" on the RV215. If already disabled on both sides and the problem persists, I then suggest you to set the "VPN Advanced settings>Exchange Mode" to "Main" and not "Aggressive" on both sides. Uncheck the "Dead Peer Detection" if the problem persists. If no difference please screenshot and send the "Advanced VPN Setup" settings for us to check them out.
Make sure you run the latest firmware release version v126.96.36.199 on the RV215;
Thank you for your time and I apologize for the delay on my answer.
My suggestion to disable some features were intended for troubleshooting purposes only, to determine a possible solution to the actual problem. In order to get a prompt support I now suggest you to get in contact with the Small Business Support Center directly to have an engineer figure this out;
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