I can not pair anymore my 4ch pro r2 to any wifi network. When turned on, the wifi led flashes very fast for about 2 seconds, then goes off for about a second, then resumes blinking and so on. The blinking sequence is very strange ( blinking very fast: FIVE blinks-1_sec_pause-FIVE blinks)
Pressing any R1-R4 keys have no effect. Holding down (for 2 seconds or more) R4 key (or any other key) have no effect. The keys look stuck and WIFI led keeps blinking as described, RE-powering on, same as described...