XSONY_NGUX
TK Veteran
I have 7 lines running and you're right in terms of zapping c lines do sometimes work well if the server is good.A good C line should be fine in Oscam.
Like bangord says, try a N line to compare readings.
Your server Provider should be able to swap you over to newcamd or mgcamd, if not try a test line to rule out server issues.
Thanks