I run into the same problem. I was connecting the MCLR pin directly to VCC
(trough a 1N4148). The problem was solved by putting a series resistor on
the anode of the diode.

Regards,

Mauricio Jancic
Janso Desarrollos
Microchip Consultant Program Member
info@janso.com.ar
www.janso.com.ar
+54 11 4542 3519

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