That's just the browser-syndrome
When reading certain posts* the neurons in one's brain simultaneously transmit too many coherent wave forms causing, for some, a semi-paralysis of synaptic function. Inability to post a response is the result. It's much like a denial of service attack on the brain.
If one stops the flow by clicking to another post the symptoms subside and synaptic traffic can resume once again.
Nothing to worry yourself about!
;-)
SDAI-Tech1
*a statistically insignificant quantity of posts worldwide.