SSL handshakes randomly fail when using BouncyCastle

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Issue

SSL/TLS handshakes with Diffie-Hellman cipher suites randomly fail from invalid padding exceptions.
IOException in getSession(): javax.net.ssl.SSLHandshakeException: Invalid padding
javax.net.ssl.SSLHandshakeException: Invalid Padding length: 79 (number may vary)

Environment

Java 6, 7, 8
BouncyCastle 1.50,1.51

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