LNK501 Startup Troubles

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Hello everybody, we use the LNK501 with 24V/35mA Output. Now we want to use the same LNK501 Layout for a Design with 24V / 50mA Output. First we had startup troubles. We changed capacitor from 2.2uF to 10uF and it works. But few days later with the same parts the LNK501 starts not with 50mA Load. After changing the Diodes it works again. The we used better Diodes (600V instead of 400V) but with the same result? The Diodes were not damaged maybe more leakage current? I do have this not with all devices. What could we do to solve the startup problem?