Fishing World

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This frequently happens to me as well.
I even ask my guildiest if they were experiencing the same kind of error but they dont. Funny to think of the fish so strong that could even dropped me out of the game. But upon observing during the peak of slow connectivity and spamming ENTER Not waiting for the dialog box on your reel and this could happen more often. So, I believe the connection around your area has something to do with this as well.
You currently experiencing this kind of error during holiday season where  connection was really bad due to neccessities and its happening everywhere around the world.
Connection will eventually comes back to normal few days after the holidays so please be patience.

Take note. this only happens to me on 4g connection at times. But not on 5g.
This was only my observation basis on my own experience.

What I did to avoid this error was to
-wait for a dialog box to appear prior pressing Enter Key.
-Avoid spamming the key multiple times during slow connection and youll gonna be fine.

You can try this as well while waiting for your ticket response.

When it comes to Pet Buff.
If ever you wanna get rid off.
Try using cloaking/cloak exceed while fishing. This way you could avoid your own Pet buff during reeling.
But,
Not in Caspen or any other Skill disabled Map.
or
If you can afford to increased a much higher Speed plan with a decent PC set up to suite your needs thats fine.
The higher speed plan the better to avoid such errors. 
BUT 
(Not Essential)
If you can play the game normaly if not holidays.
Pls dont give any bad impression for this.
I only intend to help as much as I could with this reccommendation to help solve your Issue.

Enjoy fishing...Good luck.