Error JTAG chain problem detected

My design worked for about 3 hours and now gives me this error. I just can't understand what is wrong with it now. I didn't do anything wrong.

!Error: JTAG chain problem detected

!Error: The TDI connection to the first detected device EP2C8 might be shorted to VCC or is an open circuit

!Error: The TCK and TMS connections to the device before the first detected device EP2C8 might have a problem

!Info: Detected 1 device(s)

!Info: Device 1: EP2C8

device is EP2C8Q208C8

TDI pulled high with 10Kohm resistor also TMS

TCK pulled down with same resistor value

Pin 2 on JTAG header connected to GND

Pins 4 and 6 connected to VCC 3.3V

Pin 10 connected to GND

TDO connected directly to cyclone II

MSEL 0 and 1 to GND

nCE to GND

also on board is used EPCS4SI8 but I disconnect that one but problem remains.