Your tablet is currently on a very old build but runs stable. Occasionally, "new updates" on legacy devices introduce thermal throttling to compensate for aged batteries.
The last official update (circa late 2016/early 2017) delivered: huawei mediapad t2 70 latest update new
For users looking to breathe new life into the device with "new" software, the only path is through Custom ROMs Your tablet is currently on a very old build but runs stable