1. to stop working or functioning periodically, with periods of normal operation in between failures
The printer tends to fail intermittently, sometimes working perfectly and sometimes jamming.
A impressora tende a falhar intermitentemente, às vezes funcionando perfeitamente e às vezes travando.
2. to break down or malfunction at irregular intervals rather than completely or consistently
The internet connection fails intermittently during peak hours.
A conexão de internet falha intermitentemente durante as horas de pico.