This was showing the entire time during todays contest ,and couldn't submit more than problem A! As I was facing this problem, I thought everyone was facing this issue, But when the contest ended it looked like I was the only one who was suffering from this! 
)
what should I do to avoid this ?
| № | Пользователь | Рейтинг |
|---|---|---|
| 1 | jiangly | 3810 |
| 2 | Benq | 3676 |
| 3 | Kevin114514 | 3655 |
| 4 | maroonrk | 3463 |
| 5 | strapple | 3447 |
| 6 | Um_nik | 3387 |
| 7 | heuristica | 3322 |
| 8 | turmax | 3317 |
| 9 | tourist | 3307 |
| 10 | jiangbowen | 3291 |
| Страны | Города | Организации | Всё → |
| № | Пользователь | Вклад |
|---|---|---|
| 1 | Qingyu | 155 |
| 2 | nik_exists | 150 |
| 2 | maspy | 150 |
| 4 | Um_nik | 143 |
| 5 | Errichto | 139 |
| 6 | adamant | 137 |
| 7 | AmShZ | 136 |
| 8 | BledDest | 132 |
| 9 | maroonrk | 131 |
| 10 | qwexd | 129 |
You can try signing in and giving contest through incognito mode, that has helped me sometimes. Also a stronger internet connection (if possible) helps. Other than that, I don't have any idea and just suffer my bad luck when it happens.
Do not use college wifi as it can be problem as many students try from same network.
The mirror don't have verification. That's nice.
Yesterday I faced the same problem as you.I tried m2.codeforces.com but it didn't show me problems and did not let me even just submmit.Hope this situation would be improved soon.
I was even doubting if a human I was.)))
I faced this issue on my first contest. Make sure your browser is updated, Your internet connection is good (try not to use free wifi that can be used by many people at a time).
You can try clearing cache and cookie data of your browser.
All this worked for me.
You can also use codeforc.es, this website does not have human verification. (Human verification indeed takes a long time)
Bro, Try using mirror codeforces much better than regular codeforces while contests.