Shops sometimes cannot be interacted with by select players

[Senidy]

Running:
spongeforge 1.12.2 2825 7.1.6
VillagerShops 2.1.0
Mega Menus 0.5
LangSwitch 1.4

This issue was first encountered on VillagerShops 2.0.1 but just occurred again today on the newer version. The second time, the player reported that the button to change # of items being bought/sold stopped working for ~10 sec or more so they exited the menu, and were unable to access the shop again. Nothing happens when they try to interact with the shop again. Other players are still able to use it though, only the one player has issues. Relogging does not help, but restarting server fixes it temporarily. No error messages are given in console.

In both cases, I believe the player may have had some kind of intermittent lag issue on their end, which may be a cause for this. If it means anything, the shop being used in both times this problem appeared was using minecraft:creeper model and sold things like redstone/lapis/diamond/ingots along with Pixelmon Reforged items like silicon, ruby, and sapphire. I am aware that LangSwitch throws some errors each time the shop is accessed, saying it doesn't have a translation for the Pixelmon items, but I don't think this is the cause of the problem.

[DosMike]

If a player can't access a shop and it's not lag, it might be the anti glitch system locking them out. would match the having to restart the server thing. Do me a favour and post the server log when it happens again (or look for a message like xxx(uuid) Tried to glitch a menu and was automatically banned from using menus until the server restarts..
If you see this message, please check that MouseTweaks and similar client mods are not installed on the server, and tell the player to not spam buttons as much.
If it is in fact lag you should be able to /mm pardon instead of restarting the server.
Let's not assume they are actually trying to glitch items :)

[Senidy]

I checked for messages like that, but couldn't find anything. I didn't find any messages like that in either instance - there was simply no message about it at all. Regardless, I have put the full server log from the second time that it happened at this link just in case I missed something or if there's something useful: https://pastebin.com/szb0fSzM

It starts with the scheduled restart and ends when I log in to restart server to temporarily fix the issue. The problem was reported at 4:19AM and they said it started happening just a few minutes before that. The player's username was Slowww_Pokeee.

We don't have MouseTweaks or similar mods on the server, and I trust this player enough that I can say they're likely not glitching items. I will try to use /mm pardon though, if this problem pops up again.