Guild Wars 2

I seem to be having this issue for a while since the last few patches. Players appearing offline to me but clearly online and unable to form parties with them. Only opening guild panel fixes it, but it occurs again next time I log in.

What’s not wrong here:

• I can whisper them fine.
• They can whisper me.
• They are not blocking me. I’d know if they were if they were online then go off as soon as I try to contact them/etc.

What is wrong:

• Can’t do any party functions at all. Can’t join them by right clicking them in chat or their health bar/picture/character. I can’t invite them either unless I type it out. Sometimes even then, I get a “They are offline.” message.
• I have to open guild panel to make them online again.

This is in game for some timw, not just after last few patches…
Luckly opening and closing guild tab always does the job even tho it would be nice of it worked without doing that…