keyborad disappeared and reappeared when typing

[Qifeng]

hello everyone

i got a problem that the keyboard of input method disappeaered and reappeared immediately when i was typing some time.  I've tried some third party input method and all of them have the same problem. so i guess this is a system problem.

i've trid clear these input method's data and cache, but it doesn't work

i've tried reset my phone and used xperia companion to repaired my phone, but it doesn't work too.

the system software version is 45.0.A.7.137 and the android version is 7.1.1

does there any solution to fix that? 

[Lord_viridis]

Do you find this happens mostly on browsers?

[Qifeng]

this problem could happend in any application not only on browser, such as wechat, twitter, sms, and other applicatiom

[Lord_viridis]

Which keyboard app is this?

Is there an available update?

[Qifeng]

i've tried xperia input and Google Pinyin and Switfkey. All of them have the problem. so i guess maybe it's not caused by input method. it's maybe a system or software problem